By Stephen Brown and Noah Barkin MUNICH (Reuters) - Germany's Angela Merkel said on Saturday that sending arms to help Ukraine fight pro-Russian separatists would not solve the crisis there, drawing sharp rebukes from U.S. politicians who accused Berlin of turning its back on an ally in distress. The heated exchanges at a security conference in Munich pointed to cracks in the transatlantic consensus on how to confront Russian President Vladimir Putin over a deepening conflict in eastern Ukraine that has killed more than 5,000. Ukraine's military said on Saturday that pro- Russian separatists had stepped up shelling of government forces and appeared to be amassing troops for new offensives on the key railway town of Debaltseve and the coastal city of Mariupol. The rebel offensive has triggered a flurry of shuttle diplomacy, with Merkel and French President Francois Hollande jetting to Moscow on Friday to try to convince Putin to do a peace deal. But Euro
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