Ukraine, Russia and the European Union signed a deal on Thursday that will see Moscow resume vital supplies of gas to its ex-Soviet neighbor over the winter in return for payments funded in part by Kiev's Western creditors. After several failed rounds of talks in recent weeks as conflict rumbles on despite a ceasefire with pro-Russian rebels in eastern Ukraine, the accord also eases concerns that a new 'gas war' could disrupt winter supplies if energy to EU states, notably through pipelines shut down across Ukraine since June.