Vladimir Putin is demanding that Ukraine give up all of the eastern Donbas region, renounce ambitions to join NATO, remain neutral and keep Western troops out of the country, three sources familiar with top-level Kremlin thinking told Reuters.

Ukraine’s Donbas region, consisting of Donetsk and Luhansk, is at the heart of Moscow’s goals. An industrial powerhouse in the Soviet era, it also has rich farmland, important rivers and a coastline on the Sea of Azov.