EXPLAINER: What are the key parts of Ukraine's peace deal?

A peace agreement for eastern Ukraine has remained stalled for years

MOSCOW -- A peace agreement for the separatist conflict in eastern Ukraine that has never quite ended is back in the spotlight amid a Russian military buildup near the country's borders and rising tensions about whether Moscow will invade.

Top officials from Russia, Ukraine, France and Germany are meeting Thursday in Berlin to discuss ways of implementing the deal that was signed in Belarusian capital Minsk in 2015.

Here is a look at the document’s key points and the contested issues regarding its implementation:

CONFLICT IN THE EAST