Oil falls as Ukraine, Greece heighten concerns over demand

Crude oil futures fell on Tuesday as concerns about weak demand as a result of uncertainty in Europe outweighed worries about threats to Middle East production and the effect of U.S. output cuts. "Growing concerns about whether a ceasefire will hold and Greece's problems have got people worried about demand for oil in a shaky European economy," said Phil Flynn, analyst at Price Futures Group in Chicago. "I think it all started in silver with squeezing out of long positions, t