By Gertrude Chavez-Dreyfuss and Caroline Valetkevitch NEW YORK (Reuters) -The safe-haven Japanese yen and Swiss franc climbed to two-week peaks against the U.S. dollar on Thursday, on worries about escalating Russia-Ukraine tensions that could have economic repercussions worldwide. In afternoon trading, the dollar slid to 114.845 yen, the lowest since early February. It was last down 0.4% at 114.93 yen. Against the Swiss currency, the greenback fell to 0.9189 francs, the weakest since Feb. 3. The dollar last changed hands at 0.9202 francs, down 0.2%. “Safe havens are outperforming as today’s g…

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