Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Erdogan Warns of Crisis as Syrian Offensive Strains Turkish-Russian Ties Dorian Jones ISTANBUL - A Russian-backed Syrian government offensive against the rebel-controlled Idlib enclave is putting Turkey's recent rapprochement with Russia to the test. Ankara, which backs the rebels, is voicing alarm over the attack, warning of a "humanitarian crisis." With Damascus stepping up its assault on Idlib, Turkish President Recep Tayyip Erdogan reached out Friday to his Russian counterpart, President Vladimir Putin. .