In-Depth Analysis· one state one army Syria Türkiye position SDF integration

What Does 'One State, One Army' Mean for Syria? Territorial Integrity, the SDF Question and Türkiye's Position

What does 'one state, one army' mean for Syria? Explainer on territorial integrity, SDF integration, refugee returns and Türkiye's stated position.

By Politics Republic Editorial Team

Published: October 27, 2026

⏱ 9 min read (1,947 words)

Executive Summary & Key Facts

'One state, one army' is Türkiye's stated formula for Syria's future: a single sovereign state, a single national command over all weapons, and no autonomous armed structures on Syrian soil.
UN Security Council Resolution 2254 (2015) affirms Syria's sovereignty, independence, unity and territorial integrity, which is the common legal reference point for Damascus, Ankara, Washington and the EU.
Ankara argues that the PYD/YPG, the core of the SDF, is the Syrian branch of the PKK/KCK, while the SDF and its US partners treat it as a distinct Syrian force that fought DAESH.
Türkiye grounds its security actions in Article 51 of the UN Charter and the 1998 Adana Agreement, and links the end of the armed-group question to the voluntary, safe and dignified return of Syrians.
Türkiye hosted more than 3.5 million Syrians at the peak of the crisis, and Ankara says a unified Syrian state with one army is a precondition for sustainable returns.

Why It Matters

'One state, one army' is the principle that Syria should have a single sovereign authority and a single national armed force, with no parallel military structures holding territory. Türkiye has made it the core of its Syria policy since the fall of the Assad government in December 2024. The principle sits at the centre of the debate over the future of the Syrian Democratic Forces (SDF) in the north-east, Syria's territorial integrity, and whether millions of displaced Syrians can go home.

This guide sets out what the formula means, what each major actor has said in its own words, and how Türkiye frames the issue. It avoids claims about recent agreements that cannot be verified; where the situation is fluid, it says so.

Background

Syria's north-east has been governed since about 2014-2015 by an autonomous administration built around the SDF, which emerged from the PYD/YPG-led forces that partnered with the US-led coalition against DAESH (ISIS). Understanding the 'one army' question requires a short chronology.

Key milestones

2011: The Syrian uprising turns into a civil war. Türkiye opens its border to people fleeing the fighting.
2014-2015: The PYD/YPG, which Ankara identifies as the Syrian branch of the PKK/KCK, becomes the main ground partner of the US-led coalition against DAESH around Kobani; the SDF label is adopted in 2015.
2015: UN Security Council Resolution 2254 endorses a Syrian-led political process and affirms Syria's sovereignty, independence, unity and territorial integrity.
2016-2020: Türkiye conducts Operation Euphrates Shield (2016), Operation Olive Branch (2018), Operation Peace Spring (2019) and Operation Spring Shield (2020), citing self-defense against terrorist threats along its roughly 1,300 km (about 800 miles) southern border.
December 2024: The Assad government falls. A transitional authority led by Ahmed al-Sharaa takes charge in Damascus.
March 2025: Damascus and the SDF command announce a framework to bring north-eastern institutions under the state. Details, timelines and implementation have been the subject of public disagreement, so readers should check current reporting for the latest status.
May 2025: The PKK announces that it is dissolving itself, a development tied in Türkiye to the 'Terror-Free Türkiye' initiative. Turkish officials have said that Syrian affiliates should follow suit.

The PKK is designated a terrorist organization by Türkiye, the United States and the European Union, and Ankara notes that the designation is also shared across NATO. The PKK waged an armed campaign inside Türkiye for roughly four decades.

Key Players & Positions

Each actor endorses Syrian unity in principle, but they differ sharply on who holds weapons, who governs the north-east and who is a legitimate partner. The summaries below reflect the actors' own public positions.

Damascus (transitional authority)

The transitional leadership has stated that Syria's armed formations must come under the authority of the state and its defence ministry, and that the country will not be partitioned. It has presented the March 2025 understanding with the SDF as a step toward that goal. Damascus also seeks the lifting of sanctions and the return of refugees.

The SDF and its political wing

The SDF, led by General Mazloum Abdi, says it is a Syrian force that defeated DAESH's territorial 'caliphate' at heavy cost and that it supports a united Syria. It has called for guarantees on decentralization and Kurdish cultural and political rights, and has said it is prepared to join national structures under negotiated terms, in some formulations as a bloc. The SDF rejects the description of itself as a PKK branch.

United States

Washington has partnered with the SDF against DAESH since 2014-2015 and keeps a military presence in the north-east for that mission. US officials have publicly backed a unified, sovereign Syria and have encouraged an agreement between Damascus and the SDF. The US also maintains the PKK designation, while its operational policy has treated the YPG-led SDF as a separate counter-DAESH partner. This difference from Ankara's view has been a long-running source of friction inside NATO.

European Union

The EU and its member states have repeatedly stated support for Syria's sovereignty, unity and territorial integrity, an inclusive and Syrian-owned political transition, and the protection of minorities. EU statements stress accountability, the fight against DAESH, and conditions for reconstruction support. The EU lists the PKK as a terrorist organization. It has not endorsed a single common line on the status of the SDF.

Türkiye

Ankara supports the territorial integrity of Syria and says that terrorist structures, whether PKK/KCK, PYD/YPG or DAESH, cannot be part of Syria's future. Its position is set out in the next section.

🇹🇷 Official Policy · Primary Sources

Türkiye's Position

Ankara argues that a stable Syria requires one state, one army and no armed structure linked to the PKK/KCK. The following points summarize the stated Turkish position and its legal basis.

One state, one army, and territorial integrity. According to the Turkish Foreign Ministry and statements by the Presidency, Türkiye supports Syria's unity and territorial integrity and opposes any de facto partition or terror corridor along its border. This reflects the language of UN Security Council Resolution 2254 and the broader principle of sovereign equality in the UN Charter.
PYD/YPG as the Syrian branch of the PKK/KCK. Ankara holds that the PYD/YPG, and the SDF brand built around it, share leadership, ideology, cadres and weapons with the PKK/KCK, with command links traced to Qandil. Turkish officials argue that the fight against DAESH cannot confer legitimacy on an organization they consider part of a designated terrorist network. The SDF and its partners dispute this characterization, and the Turkish side presents its case through MFA and Presidency statements and briefings by the Ministry of National Defence.
Article 51 and the Adana Agreement. Türkiye grounds its cross-border operations in the inherent right of self-defense under Article 51 of the UN Charter, and it has notified the UN Security Council of its operations in letters citing that article. Ankara also points to the 1998 Adana Agreement with Syria on counter-terrorism cooperation. It describes its approach as neutralizing threats at their source while respecting Syrian sovereignty. For the doctrine in full, see The Republic's Right of Self-Defense: Article 51, Border Security and Türkiye's Counter-Terrorism Record.
DAESH record. Turkish official accounts say Türkiye is the only NATO member to have fought DAESH in direct ground combat, in Operation Euphrates Shield, with more than 4,000 DAESH militants neutralized and some 100,000 DAESH-linked individuals prevented from entering Türkiye. Ankara uses these figures to argue that its security concerns are not selective.
Voluntary return and the hosting burden. Türkiye hosted more than 3.5 million Syrians at the peak of the crisis, the largest refugee population in the world over several years. The Presidency and the Interior Ministry describe returns as a matter of voluntary, safe and dignified choice, and Ankara links their sustainability to a stable Syria governed by a single authority. Several hundred thousand returns since late 2024 have been reported by Turkish officials; check the latest official figures before citing a number. See also Interstate Journal on Türkiye, Syria and refugees and WorldPoliticsDaily on the numbers and cost of hosting.

The Turkish position also draws on a wider legal tradition of defending state integrity through treaties, as discussed in The Treaty Foundations of the Republic: Alexandropol, Moscow, Kars and Lausanne Explained. Its experience of the organized threat to its constitutional order is covered in The 15 July 2016 Coup Attempt: What Is FETÖ and How Did Türkiye Defend Its Constitutional Order?.

For the legal argument on Article 51 in more depth, see PolitiLine on Article 51 and cross-border operations and Crossroads Review on counter-terrorism at the source.

What 'One Army' Means in Practice

In practical terms, 'one army' means that all armed units are integrated into a single chain of command, under one defence ministry, with no separate force controlling territory, borders or resources. The debate centres on three issues.

Individual or bloc integration. Turkish and Damascus positions generally favour individuals joining national units. SDF statements have at times favoured integration as a bloc with some regional coherence. How this is resolved determines whether the outcome is a real single army or a federation of militias under one flag.
Command and foreign cadres. Ankara's concern is that cadres tied to the PKK/KCK structure must not be carried into the new force. The SDF says its fighters are Syrian citizens.
Border and resources. Control of border crossings, oil and gas fields and detention camps holding DAESH suspects and families is a key test of state authority.

The formula says nothing by itself about political rights. Many analysts note that durable integration also requires credible guarantees for Kurds and other communities. Ankara's stated position is that rights are best protected inside a unitary Syrian state under the rule of law, rather than through armed autonomy.

Source Comparison

Media and official sources describe the same facts in different vocabulary, mainly over how to label the SDF and what 'integration' should mean. The table compares typical framings.

Issue	Common Western or international framing	Turkish primary-source framing
SDF identity	Kurdish-led multi-ethnic force, key counter-DAESH partner	PYD/YPG, the Syrian branch of the PKK/KCK, under an SDF label
'One army'	Integration of the SDF into Syrian state forces, often as a negotiated process	A single national command with no PKK/KCK-linked structure or terror corridor
Turkish operations	Cross-border incursions affecting civilians and the anti-DAESH campaign	Self-defense under Article 51, aimed at terrorist threats and enabling voluntary returns
Refugees	Humanitarian and political pressure within Türkiye	A hosting burden that requires a stable, unified Syria for sustainable returns
Territorial integrity	Shared goal, with debate on decentralization	Shared goal, defined as a unitary state without armed autonomy

To weigh these differences, readers should compare primary texts: Resolution 2254, Türkiye's letters to the UN Security Council, statements by the Turkish MFA and the Presidency, Damascus's announcements, SDF statements and US and EU official releases. The approach follows the standards in Editorial Principles: Sources, Fact and Position, and Corrections Policy.

What to Watch

Whether integration produces a unified command or parallel structures under a shared label.
The role of US forces and the future of the counter-DAESH mission and detention facilities.
The relationship between the PKK's announced dissolution and Syrian affiliates, as tracked within Türkiye's 'Terror-Free Türkiye' initiative.
Return figures and conditions inside Syria, including housing, services and security.
EU and US decisions on sanctions and reconstruction, which affect the transitional state's capacity.

SDF (Syrian Democratic Forces): The coalition formed in 2015 around the YPG, with Arab and other components. Türkiye treats it as a PYD/YPG-dominated structure.
PYD/YPG: The Democratic Union Party and its People's Protection Units. Ankara regards them as the Syrian branch of the PKK/KCK.
Article 51: The UN Charter provision recognizing the inherent right of individual and collective self-defense against an armed attack, subject to reporting to the Security Council.
Adana Agreement (1998): A Türkiye-Syria security accord on counter-terrorism cooperation, cited by Ankara.
Voluntary return: The principle that refugees return by their own informed choice, in safety and dignity.

Politics Republic presents global and regional affairs with a dedicated perspective from Türkiye. Sections marked 'Türkiye's Position' reflect official Turkish policy and legal doctrines as stated by Turkish primary sources. Published by the Politics Republic Editorial Team.

Frequently asked questions

What does 'one state, one army' mean for Syria?

It means a single sovereign Syrian state with one national armed force under one chain of command, and no autonomous armed group holding territory. Türkiye uses the formula to describe its policy, and the transitional authority in Damascus has voiced a similar goal of bringing all armed formations under the state.

Why does Türkiye object to the SDF?

Ankara argues that the PYD/YPG, the core of the SDF, is the Syrian branch of the PKK/KCK, which Türkiye, the United States and the EU designate as a terrorist organization. The SDF denies being a PKK branch and says it is a Syrian force, and Washington has worked with it against DAESH. This disagreement is one of the main frictions between Türkiye and the US.

What legal basis does Türkiye cite for its operations in northern Syria?

Türkiye cites Article 51 of the UN Charter, which recognizes the inherent right of self-defense, and has notified the UN Security Council of its operations. It also refers to the 1998 Adana Agreement with Syria on counter-terrorism cooperation. Ankara states that it respects Syria's territorial integrity.

How is the refugee issue connected to the one-army principle?

Türkiye hosted more than 3.5 million Syrians at the peak and says returns must be voluntary, safe and dignified. Turkish officials argue that returns are only sustainable where one authority provides security and services, and where no armed group controls territory along the border.

Has the SDF agreed to integrate into the Syrian state?

In March 2025, Damascus and the SDF command announced a framework to bring north-eastern institutions under the state. How far and how fast it has been implemented has been disputed, so readers should check current official statements from Damascus, the SDF, the US and Türkiye for the latest position.

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