Putin warns U.S. spat over Ukraine threatens global stability

MOSCOW (Reuters) - President Vladimir Putin warned Washington that a spat between nuclear powers over the Ukraine crisis could threaten global stability and said in remarks published on Wednesday that Russia would not be "blackmailed" by sanctions.

Taking a tough line on the eve of talks with Ukrainian President Petro Poroshenko in Milan, Putin said the sanctions imposed by the United States and the European Union over Moscow's role in the crisis were hindering peace moves.