A column of Russian military police arrived in Ayn el-Arab (Kobani) in northern Syria, Russia's Defence Ministry said on Wednesday.
"In accordance with the agreements reached by the presidents of Russia and Turkey on October 22 in Sochi, today, at 12 o'clock, a column of Russian military police crossed the Euphrates river and moved in the direction of the Syrian-Turkish border," the ministry said in a statement.
Ankara agreed with Washington on Oct. 17 to pause its operation for 120-hours to allow the withdrawal of YPG/PKK terrorists from the planned safe zone.
On Tuesday, Turkish President Recep Tayyip Erdoğan and his Russian counterpart Vladimir Putin held a "historic" meeting in the Black Sea resort town of Sochi just hours before the pause was set to expire.
Ankara and Moscow reached a deal under which YPG/PKK terrorists will pull back 30 km south of Turkey’s border with northern Syria within 150 hours, and security forces from Turkey and Russia will start to conduct joint patrols in the region.
In its more than 30-year terror campaign against Turkey, the PKK -- listed as a terrorist organization by Turkey, the U.S. and the European Union -- has been responsible for deaths of 40,000 people, including women, children and infants. The YPG is the Syrian offshoot of the PKK.