Swedish quantitative easing surprise, Russia-Ukraine deal lift gloom

By Jamie McGeever LONDON (Reuters) - A surprisingly aggressive dose of monetary stimulus from Sweden's central bank on Thursday injected life back into world markets which had been numbed by the stalemate in talks between Greece and its euro zone creditors. Stock markets across Europe reversed opening losses as investors welcomed the Riksbank's decision to cut interest rates below zero and buy government bonds. They extended these gains after Russian president Vladimir Putin said Russi