Ukraine accused pro-Russian rebels on Monday of hitting a refugee convoy of buses with rocket fire near the eastern city of Luhansk, killing people trapped in the burning vehicles, but the separatists denied responsibility.

• August 18, 2014

Ukrainian government forces pressed pro-Russian separatists in fighting overnight into Monday, encircling the rebel-held town of Horlivka and taking control of smaller settlements in eastern Ukraine, the military said.

• August 18, 2014

Russia may tighten retaliatory sanctions against Western nations to include a ban on imports of cars, among other things, if the United States and the European Union impose additional sanctions on Moscow, Vedomosti daily newspaper said on Monday.

• August 18, 2014

Ukrainian rebels are receiving new military equipment and troops trained in Russia, and will launch a major counter-offensive against government forces, a separatist leader said in a video released on Saturday.

• August 16, 2014

A meeting of Ukrainian, Russian, German and French foreign ministers scheduled in Berlin on Sunday could be a first step towards a Ukraine-Russia peace summit along the lines of one that took place in Normandy last month, the French government said on Saturday.

• August 16, 2014

If Russia and Ukraine slide into outright war, the United States and allies will face tough choices on how to support a friendly state they have no intention of making a full NATO member.

• August 16, 2014

Ukraine said its artillery destroyed part of a Russian armored column that entered its territory overnight and said its forces came under shellfire from Russia on Friday in what appeared to be a major military escalation between the ex-Soviet states.

• August 15, 2014

European Union foreign ministers voiced concern on Friday at reports that Russian military vehicles had crossed into Ukraine overnight, but behind the tough talk there were signs that EU unity over sanctions against Moscow was fraying.

• August 15, 2014