TREASURIES-Prices up on Ukraine unrest
* Turmoil in Ukraine spurs safety buying
* The Fed to buy $3.50 bln- $4.25 bln in debt maturing in
* Traders look to Yellen to clarify impact of soft data on
By Marina Lopes
NEW YORK, Feb 27 (Reuters) - U.S. Treasuries debt prices
inched up on Thursday as tensions in Ukraine and Russia spurred
safety buying, but investors remained cautious ahead of comments
from Federal Reserve Chair Janet Yellen on recent economic data.
Yellen, in testimony before a Senate banking committee, said
some data had been softer but it was hard to say how much
because of the weather.
Tensions over Ukraine grew overnight, with Russia's Defense
Ministry quoted as saying fighter jets along its western borders
have been put on alert, a day after it called a snap military
exercise of 150,000 troops.
"Overall earlier this morning, there has been the escalation
of the crisis in the Ukraine, which prompted risk-off trades in