By Tom Wilson and Medha Singh LONDON (Reuters) -Bitcoin tumbled over 7% on Monday to its lowest in six months, as fears of a Russian attack on Ukraine saw riskier assets worldwide extend their selloff. The largest cryptocurrency trading down 7.4% at $33,650, its lowest since July 24, taking losses from its all-time high of $69,000 hit in November past 50%. The U.S. State Department said on Sunday it was ordering diplomats’ family members to leave Ukraine in one of the clearest signs yet that American officials are bracing for an aggressive Russian move in the region. Fears of conflict pummelle…

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