Brent futures eased towards $107 a barrel on Friday as the global supply outlook improved with more Libyan supplies expected to reach the market, although growing tension between the West and Russia over Ukraine put a floor under prices. Oil prices also came under pressure as producer-group OPEC said it sees lower demand for its oil this year, highlighting concerns over the economy and competition from rival producers, just as data from China showed imports fell to a five-month low. Earlier in the week, United States said oil inventories rose on the back of a local production boom. Brent crude fell 16 cents to $107.30 a barrel by 0340 GMT, after settling 52 cents lower. The contract is set to end the week 0.5 percent higher, recouping part of the previous week's losses. U.S.