* Crimean parliament votes to join Russia
* U.S. approves asset freezes, travel bans
* U.S. jobless claims, manufacturing activity fall
* Coming up: U.S. nonfarm payrolls Friday 8:30 a.m. EST
(Rewrites throughout, adds U.S. economic data, analyst commentary, changes byline, dateline, previous LONDON)
NEW YORK, March 6 (Reuters) - Brent oil rose on Thursday on geopolitical risks over the on-going crisis in the Ukraine, while U.S. oil was pressured by economic data that pointed to weaker demand.
Crimea's Moscow-backed parliament voted to allow the southern Ukrainian region to become part of Russia on Thursday, as the U.S. ordered asset freezes and travel bans on a list of individuals it said were involved in Russia's military intervention.
U.S. oil rose to a five-month high on Monday amid fears of an armed conflict with Russia, the world's second largest oil producer, but has since given back all of its gains as domestic economic factors weighed.
Jobless claims fell, data showed on Thursday, a positive sign for the labor market, but manufacturing activity slowed indicating a potential fall in energy demand.
Oil demand is expected to decline during an upcoming refinery maintenance season in the United States and Europe.
Traders awaited Friday's nonfarm payrolls data for a fuller indication of economic strength in the world's largest oil consumer.
"The market continues to wipe out gains from the geopolitical risk because we have yet to see a supply disruption in Russian oil...and the economic data is a mixed bag," said Gene McGillian, an analyst at Tradition Energy in Stamford, Connecticut.
Brent was up 30 cents at $108.06 by 12:15 p.m. EST (1715 GMT), after settling $1.54 lower on Wednesday. The contract hit $112.39 on Monday, its highest since Dec. 30.
U.S. crude was 51 cents lower at $100.95, after dropping $1.88 in the previous session.
The Crimean parliament's vote came as European Union leaders held an emergency summit groping for ways to pressure Russia to back down and accept mediation.
EU leaders had been set to warn but not sanction Russia over its military intervention on the Black Sea peninsula. Sanctions against Russia could rattle markets if they disrupted oil supply to Europe.
U.S. jobless claims fell by 26,000 to a three-month low last week. Manufacturing data showed a slowdown in activity in January, which pressured U.S. oil.
Nonfarm payrolls are due to be released Friday at 8:30 a.m. EST (1330 GMT). A Reuters survey forecast an increase of 150,000 jobs in February, stronger than the weather-depressed gains of 113,000 in January and 75,000 in December.
Oil was pressured further by government data released Wednesday that showed U.S. crude oil stockpiles rose by slightly more than expected last week, while imports increased and refinery output fell.
Further weighing on oil demand, U.S. oil refiners will likely take 1,608,000 bpd of capacity offline in the week ending March 7, up from 1,412,000 bpd the previous week, data from research company IIR showed.
(Additional reporting by Shadi Bushra and Peg Mackey in London, and Jacob Gronholt-Pedersen in Singapore; Editing by David Evans, William Hardy and Marguerita Choy)