BUENOS AIRES, Argentina (AP) — White House spokeswoman Sarah Huckabee Sanders says President Donald Trump will speak informally with the leaders of Turkey and South Korea at the Group of 20 summit in Argentina rather than in formal meetings.

Trump will talk informally with Turkish President Recep Tayyip Erdogan and South Korean President Moon Jae-in at the G-20 summit.

Sanders spoke to reporters traveling with the president on Air Force One. She did not say why the meetings have been downgraded.

Shortly after leaving the White House for the summit, Trump tweeted that he had canceled his meeting with Russian President Vladimir Putin, citing Russia’s seizure of Ukrainian vessels.

Sanders says Trump made the decision to cancel while aboard Air Force One and after speaking with Secretary of State Mike Pompeo and White House national security adviser John Bolton.