U.S. crude, Brent rise on Ukraine risk, new EU sanctions

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* Pro-Russia rebels call victory in East Ukraine vote * Top exporter Saudi Arabia would supply more oil if needed * Libya's oilfields, pipelines to reopen later Monday * Coming up: API data Tuesday at 4:30 p.m. EDT (2030 GMT) (Adds settlement prices and analyst comments) By Elizabeth Dilts NEW YORK, May 12 (Reuters) - Crude oil futures rose on Monday as tensions in Ukraine prompted the European Union to widen sanctions, while Russia reiterated that it could cut off Kiev's natural gas supplies. Russia's state-owned Gazprom said that unless Kiev pre-paid for the next month's natural gas deliveries by June 2, it would disrupt or reduce supplies. Saudi Arabia said it would step in to cover any potential shortage of oil that could result from the tension between Russia and Ukraine, which reassured investors and capped gains in oil.

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