By  Saumya Vaishampayan and  Barbara Kollmeyer 
 

The dollar fell against the Japanese yen Thursday as a flare-up in tensions between Ukraine and Russia overshadowed economic data.

Russia said it started military exercises near the Ukrainian border. The news came after Ukrainian forces killed pro-Russian insurgents outside the city of Slovyansk as Ukraine tried to reclaim its eastern region. The deaths elicited a warning from Russian President Vladimir Putin.

The dollar dropped to ¥102.28 from ¥102.53 late Wednesday. The yen is seen as a haven asset that tends to gain at times of increased uncertainty.

The dollar had earlier risen against most rivals, including the yen, after a stronger-than-expected reading on durable-goods orders.

Orders for big-ticket items such as computers and heavy machinery surged 2.6% in March, marking the biggest gain in four months. The data were the latest to support the idea of a rebound in economic growth after a severe winter, giving investors confidence that the Federal Reserve will end its bond purchases before the close of the year.

An end to the Fed's bond purchases would pave the way for an increase in interest rates, which would make the dollar and U.S. assets more attractive.

The ICE dollar index, a gauge of the dollar's strength against six rivals, fell to 79.829 versus 79.869 late Wednesday. The WSJ Dollar Index, which measures the greenback against more rivals, fell to 73.08 versus 73.11.

The euro was at $1.3811 versus $1.3816 late Wednesday.

European Central Bank President Mario Draghi reiterated the bank's concern about the high exchange rate Thursday and said further euro strength could trigger easing measures. Any worsening of the inflation outlook in the euro zone may lead to broad-based asset buying, he said in Amsterdam.

The British pound rose to $1.6791 from $1.6782.

Write to Saumya Vaishampayan at svaishampayan@marketwatch.com and Barbara Kollmeyer at bkollmeyer@marketwatch.com