The Kurdish-led authorities in north-eastern Syria say a US-backed Kurdish militia has begun withdrawing from territory along the border with Turkey.
The "first practical steps" came on the weekend, when the People's Protection Units (YPG) pulled out some fighters and weaponry from two areas.
The move is part of a deal with Turkey and the US, which has forces there.
Turkey has threatened to launch an assault unless the YPG pulls back from the border and a "safe zone" is set up.