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

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

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

Dozens of heavy Russian military vehicles massed on Friday near the border with Ukraine, while Ukrainian border guards crossed the frontier to inspect a huge Russian aid convoy

• August 15, 2014

Artillery shells hit close to the centre of Ukraine's separatist-held city of Donetsk for the first time on Thursday, killing at least one person, as a large Russian aid convoy rumbled towards the border.

• August 14, 2014

Ukraine said on Monday it was in talks with Moscow over the return of 311 Ukrainian soldiers and border guards who had been forced by fighting with separatists to cross into Russia, but Russian border authorities said the troops were seeking asylum.

• August 4, 2014