Ukraine crisis
Russia seizes three Ukrainian naval ships off Crimea
The confrontation at sea is a dangerous development in the long-running conflict pitting Ukraine against Russia and Russian-backed rebels in the east of the...
Officials said Ukraine had agreed to abide by a new seven-day truce proposed by Russian separatists.
The US Department of the Treasury added dozens of people and companies to the list.
The EU in June extended energy, financial and defence sanctions on Russia over the conflict in Ukraine.
Russia said it had thwarted armed Ukrainian attempts to get saboteurs into the peninsula.
Ukrainian PM Volodymyr Groysman said lessons learned from Chernobyl should be heeded all over the world.
Some 200 Canadian troops will provide training in combat skills to Ukraine’s National Guard from August.
US Treasury Secretary Jack Lew met with Ukrainian leaders in Washington.
Troops, weaponry including rocket launchers, tanks and artillery populate the makeshift base.
One serviceman from Ukraine's government forces had been killed and three others wounded.
Relations between Moscow and Washington have soured over the conflict in Ukraine.
Ukraine has repeatedly asked for international help to boost its defensive capabilities.
The compromise reached at an EU summit maintains EU unity on sanctions against Moscow.
The threats came in statements issued after a video conference that brought together Obama and world leaders.
A military official said rebels had shelled Ukrainian positions 22 times over the past day.
The move was Kiev's most direct step to acknowledge that the ceasefire was finally holding
Fighting has eased in eastern Ukraine in recent days, raising hope that a ceasefire can finally take effect.
A truce to end fighting appeared stillborn last week after rebels ignored it.
The exchange is one of the first moves to implement the peace deal reached on 2 February.