Russia's President Vladimir Putin launched exercises by strategic nuclear missile forces on Saturday and Washington said Russian troops massed near Ukraine's border were "poised to strike".
As Western nations fear the start of one the worst conflicts since the Cold War, U.S. Defence Secretary Lloyd Austin said Russian forces were beginning to "uncoil and move closer" to the border with its former Soviet neighbour.
"We hope he steps back from the brink of conflict," he told a news conference on a visit to Lithuania, saying an invasion of Ukraine was not inevitable.
Russia ordered the military build-up while demanding NATO stop Ukraine ever
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