President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE will hold informal talks with the leaders of South Korea and Turkey at this weekend's Group of 20 (G-20) summit in Argentina instead of bilateral meetings as previously scheduled, the White House announced Thursday.

Press secretary Sarah Huckabee Sanders told reporters aboard Air Force One that Trump's bilateral meetings with South Korean President Moon Jae-in and Turkish President Recep Tayypip Erdoğan were changed to "pull-asides," meaning he will huddle informally with each leader on the sidelines of the summit.

To be clear - the meetings with S. Korea and Turkey are still on the schedule and have not been canceled. https://t.co/Oo3QDSRLtU — Sarah Sanders (@PressSec) November 29, 2018

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The announcement came shortly after Trump tweeted that he will not meet with Russian President Vladimir Putin as previously announced.

The president cited a recent incident between Russia and Ukraine's navy, and said he hoped to hold “a meaningful Summit again as soon as this situation is resolved!”

Both Turkey and South Korea are key U.S. allies on an array of global issues.

The U.S. and South Korea have worked together in recent months to encourage North Korean leader Kim Jong Un to abandon his country's nuclear arsenal.

Turkey, a NATO ally, has been at the forefront of the investigation into the killing of Saudi journalist Jamal Khashoggi. The Washington Post contributor and U.S. resident was killed after entering the Saudi consulate in Istanbul on Oct. 2.

Trump and Erdoğan discussed Khashoggi's death during a dinner earlier this month to mark the 100-year anniversary of the end of World War I.

In the time since, the CIA has reportedly concluded Saudi Crown Prince Mohammed bin Salman ordered the killing, but Trump has indicated he will not dole out additional punishment against the kingdom.

Trump has said he will not meet with the crown prince in Argentina because of scheduling constraints.

National security adviser John Bolton told reporters on Tuesday that Trump will hold bilateral meetings during the two-day summit with the heads of state of Germany, Argentina, Japan, India and China.