By Aleksandar Vasovic MARIUPOL, Ukraine (Reuters) - Separatists attacked a base of the Ukrainian national guard overnight and Kiev said three separatists were killed, the worst bloodshed yet in a 10-day pro-Russian uprising in east Ukraine, overshadowing crisis talks to resolve the conflict. Ukrainian, Russian and Western diplomats arrived for the emergency talks in Geneva, but there was little hope of any progress in resolving a crisis that has seen armed pro-Russian fighters seize whole swathes of Ukraine, while Moscow masses tens of thousands of troops on the frontier. President Vladimir Putin, who overturned decades of post-Cold War diplomacy last month by declaring Russia's right to intervene in neighboring countries and annexing Ukraine's Crimea region, accused the authorities in Kiev of plunging the country into an "abyss".

BRUSSELS (AP) — The European Union is warning Russia that interfering with gas deliveries to Ukraine to apply political pressure would backfire by damaging its reputation as a reliable supplier for the EU.