The head of NATO said on Wednesday he saw no sign that Russia was respecting its international commitments over Ukraine as Britain warned Moscow it could face tougher European Union sanctions unless it acted to stop fighting in eastern Ukraine.

• June 25, 2014

President Barack Obama urged Russian President Vladimir Putin on Monday to support peace in Ukraine and said Moscow would face further sanctions if it did not take steps to reduce tensions in the country, the White House said on Monday.

• June 24, 2014

Ukrainian government forces accused pro-Russian separatists of firing on Ukrainian military checkpoints in several parts of the east on Monday night despite a ceasefire declared by the rebels.

• June 24, 2014

Baltic leaders said on Saturday they would back further sanctions against Russia at a European Union summit next week unless there was a de-escalation in eastern Ukraine where Kiev is trying to quell a pro-Russian insurgency.

• June 23, 2014

Britain's Foreign Secretary William Hague warned Russia on Monday that the EU was ready to impose tougher sanctions over the crisis in Ukraine if it is not satisfied with Moscow's response to Kiev's peace plan.

• June 23, 2014

Pro-Russian separatists attacked Ukrainian posts on the border with Russia and a military base, and tried to storm an airforce base overnight into Saturday, government forces said, putting a Ukrainian unilateral ceasefire under pressure.

• June 21, 2014

Baltic leaders said on Saturday they would back further sanctions against Russia at a European Union summit next week unless there was a de-escalation in eastern Ukraine where Kiev is trying to quell a pro-Russian insurgency.

• June 21, 2014

The United States blacklisted seven separatists in Ukraine on Friday and threatened "scalpel" sanctions on Russia's financial, defense and high-tech industries as more Russian military material has flowed into Ukraine.

• June 20, 2014