International sanctions were tightened significantly after Russia invaded Ukraine in 2022, with Washington announcing its harshest round of sanctions on January 10. Western companies have either sold or ceded energy assets to Russian firms and European governments have taken over units of Russian energy firms, while Moscow has taken retaliatory measures against Western companies with units in Russia. Here is a summary of some of the energy assets and companies affected: SAKHALIN-1 OIL AND GAS PROJECT Exxon Mobil Corp (NYSE: XOM ) held a 30% operator stake in Sakhalin-1, which is a project to develop oil and gas off the coast of Sakhalin Island. Russian company Rosneft, India's ONGC Videsh and Japan's SODECO were partners. In 2022, Exxon took a $4.6 billion write-down for exiting the development Sakhalin-1.