By Tom Westbrook SINGAPORE (Reuters) – The safe-haven yen hit a near three-week high and the euro and riskier currencies fell on Tuesday as Russia ordered troops into breakaway parts of eastern Ukraine and the region stood on the brink of war. The yen edged about 0.2% higher to 114.50 to the dollar early in the Asia session and the euro dipped about 0.1% to a one-week low of $1.1297. The Swiss franc, another safe-haven, hit a one-month high overnight. “It is remarkably restrained…but in these circumstances risk metrics are the driving force,” said NAB head of foreign exchange strategy, Ray A…

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