By Stephanie Kelly NEW YORK (Reuters) – Oil prices rose on Monday to end January with their biggest monthly gain in a year, boosted by a supply shortage and political tensions in Eastern Europe and the Middle East. The most-active Brent contract, for April delivery, traded 74 cents higher, or 0.8%, to settle at $89.26 per barrel. The front-month contract, for March delivery, which expired at the end of the session, rose $1.18, or 1.3%, to finish at $91.21. U.S. West Texas Intermediate crude rose $1.33, or 1.5%, to close at $88.15 a barrel. The benchmarks recorded their highest levels since Oct…