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The Idlib De-escalation Zone was established as one of four such zones under the Astana Process, a parallel track to the UN-led Geneva talks on Syria. The framework was agreed in May 2017 in Astana (now Nur-Sultan), Kazakhstan, by the three guarantor states: Russia, Turkey, and Iran. The zones were intended to halt fighting between Syrian government forces and armed opposition groups, allow humanitarian access, and create conditions for a political settlement.
The Idlib zone covers most of Idlib Governorate and adjacent parts of Aleppo, Hama, and Latakia provinces. It became the largest and most consequential of the four because, as government forces retook territory elsewhere, opposition fighters and civilians were repeatedly bused into Idlib under "reconciliation" agreements. By 2018, the area held roughly three million civilians, around half of them internally displaced.
Turkey assumed primary responsibility for the zone, establishing a series of observation posts along its perimeter. In September 2018, Presidents Erdoğan and Putin signed the Sochi Memorandum, which created a demilitarized buffer strip and required the withdrawal of heavy weapons and listed jihadist groups. Implementation was incomplete: Hayat Tahrir al-Sham (HTS), a UN-designated terrorist organization rooted in the former Nusra Front, consolidated control over much of the area.
The de-escalation arrangement repeatedly broke down. Major Syrian and Russian offensives in 2019 and early 2020 displaced roughly a million people toward the Turkish border. A renewed Russia–Turkey ceasefire signed in Moscow in March 2020 created a security corridor along the M4 highway and joint patrols, producing a relative but fragile lull.
For MUN and policy analysts, Idlib illustrates the limits of guarantor-based conflict management, the entanglement of counter-terrorism rhetoric with civilian protection, and the role of regional powers in displacing UN-centered diplomacy.
Russia, Turkey, and Iran, under the Astana Process launched in January 2017. Turkey took the lead role on the ground in Idlib through observation posts and patrols.
The framework formally persists but has been repeatedly violated. The most recent stabilizing arrangement is the March 2020 Russia–Turkey Moscow protocol, which established a buffer along the M4 highway.
It hosts roughly three million civilians, around half displaced from other parts of Syria, in an area dominated by HTS and bordering a Turkey that has largely closed its frontier to new refugees.