Russian President Vladimir Putin must meet with Ukrainian President Volodymyr Zelenskyy before he can secure a bilateral with President Donald Trump, a White House official said Thursday.

President Donald Trump popped out on the roof of the White House West Wing Tuesday morning, appearing to take stock of several areas including the Rose Garden.

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.