By Polina Nikolskaya and Tom Balmforth DONETSK, Ukraine/MOSCOW (Reuters) -President Vladimir Putin launched exercises by Russia’s strategic nuclear missile forces on Saturday and Washington said Russian troops massed near Ukraine’s border were moving forward and “poised to strike”. With Western nations fearing what could be one of 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 (Putin) steps back from the brink of conflict,” Austin told a news c…

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