French President Francois Hollande said that local elections in Ukraine, planned for October, will be delayed until next year.
Russia is still sending weapons to separatist rebels battling the Ukrainian government despite a fresh truce in the war-torn east of the country.
Hundreds of pro-Kiev activists from Crimea's Tatar community launched a blockade of roads from Ukraine to the Crimean peninsula to protest Russia's seizure of their home region.
Ukrainian President Petro Poroshenko expanded a list of sanctions against Russian companies and individuals held responsible for the ex-Soviet state's eastern uprising and for Moscow's annexation of Crimea.
Billionaire mogul and White House frontrunner Donald Trump accused US President Barack Obama of paying "lip service" on Ukraine and failing to stand up to Russian strongman Vladimir Putin.
Ukrainian President Petro Poroshenko accused Russia of challenging the "entire democratic world" by annexing Crimea and allegedly arming separatist rebels in the east of his ex-Soviet state.
Ukrainian Prime Minister Arseniy Yatsenyuk criticised as "anti-Ukrainian and anti-European" a deal between Russia's energy giant Gazprom and several Western firms to build a second gas pipeline under the Baltic Sea.
The leaders of France, Germany, Russia and Ukraine agreed to hold an October summit on ending the conflict in Ukraine.
Ukrainian Prime Minister Arseniy Yatsenyuk warned that any attempt to hold "unlawful" elections in rebel-run areas in the country's east would constitute a breach of a February peace deal.
IMF chief Christine Lagarde heaped praise on Ukraine's reform efforts in a visit to Kiev following a deal to restructure the country's debt burden.
EU foreign policy chief Federica Mogherini expressed concern over "very worrying" deadly clashes in Kiev as Ukrainian lawmakers backed an autonomy plan for rebel regions.
Ukrainian President Petro Poroshenko said those behind deadly Kiev clashes that erupted after a vote on autonomy for separatist eastern regions deserved severe punishment.
Anya wasn't even born when Chernobyl exploded nearly 30 years ago, but even today its radioactive fallout stalks her and other Ukrainian youngsters growing up near the disused plant.
A Dutch lecturer accused a top university in Kazakhstan of sacking him after he tried to hold a talk on the "Russian-Ukrainian conflict", a claim denied by the university.
The EU sharply criticised Russia on Tuesday for the jailing of Ukrainian filmmaker and Kremlin critic Oleg Sentsov, calling it a violation of international law.
A Russian military court is set to announce its verdict against a Ukrainian filmmaker who faces a lengthy prison term on terror charges in a trial decried by the West.
Kazakhstan has been put on the map of the world's riskiest sovereign debt by Bank of America Merrill Lynch. Really?
Russian President Vladimir Putin burnished his action man image by diving down in a mini-submarine to explore a shipwreck off the coast of the Crimea peninsula that Moscow seized from Ukraine last year.
UN Secretary-General Ban Ki-moon expressed serious alarm over the upsurge in fighting in Ukraine and called for urgent steps to de-escalate the violence.
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