President Donald Trump could meet in person with Russian President Vladimir Putin as soon as next week as he seeks to broker an end to the Russia-Ukraine war, a White House official said Wednesday. The White House said Trump was also open to a meeting with both Putin and Ukrainian President Volodymyr Zelenskyy.

Trump, who had boasted he could end the conflict within 24 hours of taking office, has given Russia until Friday to make progress towards peace or face new penalties.

Trump has met in-person with Zelensky at least three times since returning to office, including a Feb. 28 meeting where he lashed out at the Ukrainian president and accused him of prolonging Russia’s invasion. The two leaders met again on April 26 on the sidelines of Pope Francis’ funeral and in The Hague on June 25.