Key crude oil prices rose by 1 percent to their highest levels since late-2014 on Monday, pushed up by a deepening economic crisis in Venezuela and a looming decision on whether the United States will re-impose sanctions against Iran.
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Brent crude oil futures were at $75.57 per barrel at 0650 GMT, up 70 cents, or 0.9 percent, from their last close. Earlier in the session, they touched their highest since November 2014 at $75.89 a barrel.
U.S. West Texas Intermediate (WTI) crude futures rose 70 cents, or 1 percent, to $70.42 per barrel. Monday was the first time since November 2014 that WTI had climbed above $70 per barrel.
Meanwhile, China's Shanghai crude oil futures, launched in March, broke their dollar-converted record-high of $71.32 per barrel by rising as far as $72.54 on Monday.
Open interest and traded volumes for Shanghai crude also hit a fresh record on Monday.
Analysts warned that the deepening economic crisis in major oil exporter Venezuela threatened to further crimp its production and exports.
Shannon Rivkin, investment director of Australia's Rivkin Securities, said that oil prices had been driven up due to "growing concerns over the economic collapse of Venezuela and its oil industry, plus possible new sanctions against Iran from the Trump administration".
U.S. oil firm ConocoPhillips has moved to take key Caribbean assets of Venezuela's state-run PDVSA to enforce a $2 billion arbitration award, actions that could further impair PDVSA's declining oil production and exports.
Venezuela's oil output has halved since the early 2000s to just 1.5 million barrels per day (bpd), as the South American country has failed to invest enough to maintain its petroleum industry.
Beyond Venezuela's woes, Greg McKenna, chief market strategist at futures brokerage AxiTrader, said "the big story this week is going to be about oil and the Iran Nuclear deal". Most market participants expect Trump to withdraw from the pact, he said.
Iran re-emerged as a major oil exporter in 2016 after international sanctions against it were lifted in return for curbs on Iran's nuclear program.
Expressing doubts over Iran's sincerity, Trump has threatened to walk away from the 2015 agreement by not extending sanctions waivers when they expire on May 12, which would likely result in a reduction of Iran's oil exports.
Looming over markets, however, is surging U.S. output, which has soared by more than a quarter in the last two years, to 10.62 million bpd.
U.S. output will likely rise further this year, towards or past Russia's 11 million bpd, as its energy firms keep drilling for more.
U.S. energy companies added nine oil rigs looking for new production in the week to May 4, bringing the total count to 834, the highest level since March 2015, energy services firm Baker Hughes said last Friday.
(Reporting by Henning Gloystein and Roslan Khasawneh; Editing by Richard Pullin and Joseph Radford)