The three oil giants announced in news releases that they were "immediately" suspending operations in Russia.
Oil prices rose to top $100 a barrel Thursday after the IEA warned a coming fall in Russian supply won't make up for an expected drop in demand.
Buffett's Berkshire Hathaway scooped up another 18 million Occidental shares in three days, raising its stake to 136 million shares or 15%.
A group that includes BP, Shell, and ExxonMobil sent a letter to central banks asking for liquidity amid a worsening crisis in the energy market.
Buyers are abandoning Russia as sanctions weigh on its oil output, potentially causing the "biggest supply crisis in decades," the IEA said.
Chevron's moves in Venezuela would boost crude supplies to offset the loss of banned Russian energy imports to the US.
Oil fell by as much as 5% as Russia and Ukraine prepared for more peace talks, while a surge in Covid cases in China shut a major commodities hub.
Buffett snapped up 27.1 million shares in three days this week, lifting Berkshire Hathaway's Occidental stake by 30% to 118 million shares.
Gas prices in Europe skyrocketed after Russia invaded Ukraine. But glassblowers in Murano have been shutting off their furnaces since last year.
Crude oil steadied above $100 a barrel, but volatility remained high, after the price plunged earlier this week from 14-year highs near $140 a barrel.
34-year-old Sam trains hard doing CrossFit and weight-lifting, but nutrition coach Dr Mike Molloy said he should eat more carbs to reach his goals.
See Leonid Nevzlin's Facebook post explaining why the former oil tycoon is giving up his Russian passport 20 years after fleeing the country.
The energy sector ETF XLE has outperformed a popular S&P 500 ETF by more than 50 percentage points since January.
Buffett determined Occidental CEO Vicki Hollub was making exactly the right moves, and swiftly built an almost 10% stake in the energy company.
The ruble plunged after the US and its allies discussed further retaliation against Russia's invasion of Ukraine via an embargo on its oil supplies.
The activist investor slammed Occidental's financing deal with Buffett's Berkshire Hathaway in 2019 as overly generous to the conglomerate.
Musk's latest tweet comes two days after he backed an increase in US oil and gas output to counter any decline in Russian supplies.
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