Obama toughens line on Putin over Ukraine at G20 summit

BRISBANE Australia (Reuters) - U.S. President Barack Obama said on Sunday that Russia would remain isolated by the international community if President Vladimir Putin continued to violate international law in Ukraine, some of his toughest remarks yet on the crisis.

Putin has come under intense pressure from other leaders at this weekend's G20 summit in Brisbane over his government's backing for pro-Russian rebels in Ukraine, where a conflict has killed more than 4,000 people this year.