President Tayyip Erdogan will seek steps from Russia's Vladimir Putin to safeguard Turkish troops in the face of an offensive by the Syrian army in the country's northwest when the two leaders meet on Tuesday, a senior Turkish official said. Erdogan, who is making a one-day visit to Russia, told Putin last week that attacks by Syrian President Bashar al-Assad's forces were causing a humanitarian crisis and threatened Turkey's national security. The official said that the security of Turkish soldiers in Syria would be one of the key topics at the meeting. The meeting is due to start at 1:30 p.m., with a joint statement to be issued at 4 p.m.

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"We expect Russia to use its influence over the regime on this matter. If there is even the smallest attack on Turkish soldiers, we will retaliate against this," the official said. Syrian troops have encircled rebels and a Turkish military post in northwest Syria in an offensive to reclaim territory and towns the government lost early in the war. Turkey has supported some rebel factions in the northwestern Idlib region, while Russia and Iran back Assad. The military observation post near the town of Morek is one of 12 that Ankara established in northwest Syria under a deal with Moscow and Tehran two years ago to reduce fighting between Assad's forces and rebels. "Any step or attack that would violate the agreement should be avoided, but unfortunately we see examples of these in recent times," the official said. "We expect Putin to take steps that will alleviate the problem there." Erdogan and Putin hold frequent talks and have forged close ties focused on energy and defense cooperation. In July, Turkey began taking delivery of Russian S-400 missile defense systems — a move that strained ties with Ankara's NATO ally the United States. Turkish Defence Minister Hulusi Akar said on Monday that delivery of the second battery of the S-400 system would begin on Tuesday.