ISTANBUL                -              Turkey and Russia, which back opposing sides in Syria’s war, agreed in 2018 to set up a de-escalation zone in the northwestern region. But their fragile cooperation has been disrupted by a Syrian government offensive in Idlib, in which 13 Turkish soldiers have been killed in the past two weeks.

Ankara has said it will use military power to drive back the Syrian forces unless they withdraw by the end of February, and President TayyipErdogan threatened to strike Syrian government forces anywhere in Syria if another Turkish soldier was hurt.

Russia, which backs Syrian President Bashar al-Assad, says Turkey has flouted deals it made with Moscow and aggravated the situation in Idlib. The Kremlin also said Ankara had failed to neutralize militants there.

Turkish Vice President FuatOktay told broadcaster NTV that Turkey was determined to stop Syrian advances in Idlib, and that Ankara had conveyed its position to Moscow during ongoing talks.

“We cannot overlook the cruelty happening in our neighbor,” Oktay said. “Turkey has fulfilled its responsibilities in Idlib. Some of our observation posts have fallen into areas controlled by the (Syrian) regime,” he said, referring to Turkish military observation posts established in Idlib under the 2018 deal.

Foreign Minister MevlutCavusoglu said later on Saturday that Turkey wants to resolve matters with Russia over Idlib through diplomacy, but will take other steps if necessary.

“If it won’t work through diplomatic channels, we will take the necessary steps,” Cavusoglu told reporters at the Munich Security Conference.

He added that a Turkish delegation would go to Moscow on Monday to hold talks over Idlib and that he would meet his Russian counterpart Sergei Lavrov later in the day.

Iran, which also supports Assad, said last week it was ready to help Ankara and Damascus resolve their disputes.

The escalation of violence in Idlib has also caused hundreds of thousands of people to abandon their homes and head north to the Turkish-Syrian border, many trudging by foot through snow in freezing temperatures, to escape air strikes and artillery fires by the Russian-supported government forces.

Turkey, which currently hosts 3.6 million Syrian refugees, has said it cannot handle a new influx from Idlib. It has poured more than 5,000 troops, several convoys of military vehicles and equipment to the region, including tanks, armored personnel carriers and radar equipment to bolster its positions.

As the Syrian government continued its offensive, Turkish and Russian officials held talks in Ankara to tackle the dispute. Erdogan has also spoken on the phone twice with Russian President Vladimir Putin since the Turkish troops were killed.