An assault on rebel-held northwest Syria by government forces has pushed some 700,000 people to flee toward the Turkish border and raised the specter of an international crisis, U.S. Special Envoy for Syria James Jeffrey said on Thursday.
Backed by Russian air power, government forces have advanced on Idlib at a rapid clip since last week, taking back dozens of towns and upending a region where millions have taken refuge since the start of Syria's nearly nine-year war.
The campaign has ratcheted up tensions between Moscow and Ankara. Turkey fears a fresh wave of migrants piling across its border and has a dozen observation posts in Idlib, part of a de-escalation agreement it says Russia is now violating.
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