
The Kremlin on Wednesday accused Washington of betraying the Kurds by withdrawing its forces from northern Syria and leaving allies alone in the face of a Turkish offensive.
US President Donald Trump had announced in early October that American forces would withdraw from Syria, paving the way for Turkey to push into the border area against the Kurdish People's Protection Units (YPG) militia it considers "terrorists".
"The US were the closest allies for the Kurds for several years. In the end, the US abandoned the Kurds, effectively betraying them," Kremlin spokesman Dmitry Peskov told Russian news agencies.
"They prefer to leave the Kurds at the border and practically force them to fight the Turks," he said.
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Turkey paused its offensive into Syria on October 17. On Tuesday evening, it announced that the offensive would be halted following a retreat of Kurdish forces from border zones.
Russian President Vladimir Putin and Turkish counterpart Recep Tayyip Erdogan, both involved in the conflict from opposite sides, struck a deal on northern Syria on Tuesday.
Meanwhile, state media reported that Russian forces crossed the Euphrates River in Syria and headed for the border with Turkey under a deal for the withdrawal of Kurdish forces.
The Rossiya-24 television channel and TASS news agency quoted the defence ministry as saying the convoy of Russian military police had crossed the river at noon (0900 GMT) and "advanced towards the Syrian-Turkish border".
The agreement will see Russian military police and Syrian border guards "facilitate the removal" of Kurdish People's Protection Units (YPG) fighters and their weapons from within 30 kilometres (18 miles) of the Turkish-Syrian border.
This withdrawal must be finalised within 150 hours.
It was reached after marathon talks between President Recep Tayyip Erdogan and President Vladimir Putin in Russia on Tuesday.
It will also see Turkey preserve a "safe zone" inside Syria about 120 kilometres long (75 miles) and 32 kilometres deep. Russia and Turkey will eventually launch joint patrols along the zone.