The US has slowed the sale of Russian oil giant Lukoil’s international assets to use them as a bargaining chip in the Ukraine peace talks, according to four sources familiar with the discussions.On Thursday, the US Office of Foreign Assets Control will extend the February 28 deadline to April 1 for deals to be concluded, an OFAC document reviewed by Reuters showed.For the latest updates on the Russia-Ukraine war, visit our dedicated page.US, Russian and Ukrainian government officials have not made a breakthrough in talks in Geneva, Abu Dhabi and Miami in recent weeks to negotiate a peace deal in Ukraine. These discussions included the US sanctions on Russia’s top oil producer, state-run Rosneft, as well as on second-largest producer Lukoil, according to three sources who were briefed on the meetings.The next round of talks between the US, Russia and Ukraine is planned for March.OFAC has already extended the deadline three times for potential buyers to negotiate with Lukoil for assets