Turkey on Friday said an accord with Russia to coordinate their air forces in Syria will prevent clashes between its warplanes and those of Russia and also the regime of Bashar al-Assad.

Ankara and Moscow have since the onset of the Syrian conflict in 2011 stood on opposite sides of the civil war, with Russia backing Assad and Turkey calling for his ouster.

But joint coordination efforts have intensified after Turkey and Russia patched up diplomatic relations strained by the shooting down of a Russian warplane over Syria by Turkish forces in November 2015.

Turkish Defence Minister Fikri Isık confirmed Russian statements that Moscow and Ankara had agreed to coordinate their air forces in Syria.

“The accord made with Russia includes coordination. Within this, the appropriate coordination will be made to ensure Turkish aircraft do not come into confrontation with those of Russia or the regime in Syria,” he said, quoted by the Anadolu agency.

Ankara has always vehemently denied any secret contacts with the Assad regime during the Syria conflict.

However, Turkish officials have on occasion acknowledged that Assad is a player who cannot be ignored in Syria and could potentially stay on in a post-war transition.

Russia and Turkey have spearheaded a shaky ceasefire in Syria, which Moscow and Ankara hope will lead to Syria peace talks in Kazakhstan beginning on January 23.

Both countries are active on the ground in Syria. Russia has been there since September 2015 to bolster Assad, and Turkey launched an incursion against jihadists and Kurdish militia on the border area in August 2016.

Moscow said Thursday Russia and Turkey signed an agreement spelling out mechanisms to “coordinate” their air forces in Syria when conducting strikes “on terrorist targets”.