Oil futures fell for the fourth time in five sessions after U.S. officials said Ukraine agrees with a U.S.-drafted peace plan to end the Russia-Ukraine war, with some details still to be sorted out.

Oil prices extended an earlier decline on Tuesday after news reports cited a U.S. official saying that Ukraine had agreed to a peace deal. Brent futures were down $1, or 1.6%, at $62.37 a barrel at 1346 GMT.

Live coverage of Russia’s war against Ukraine with breaking news and frontline updates, updated (4) times today. Ukraine’s Security Service (SBU) carried out a drone strike on the Russian Black Sea port city of Novorossiysk overnight on Nov.

The U.S. Army’s top two leaders will arrive in Ukraine this week for unannounced high-level talks expected to focus on boosting efforts to negotiate an end to the country’s war with Russia.

U.S. Army Secretary Dan Driscoll held talks with Russian officials in Abu Dhabi on Monday, a U.S. official told Reuters, the latest effort by President Donald Trump's administration to broker a peace agreement between Russia and Ukraine.

Terms of the US-drafted, 28-point framework to end the war closely track Russian demands, according to news reports.

CBS News' Natalie Brand reports from Washington, D.C.