The Czech prime minister said he had a meeting scheduled with Ukrainian President Volodymyr Zelensky on the UN sidelines to discuss bilateral relations.

The annual event opens on Tuesday. The Czech government said Babis would address the gathering on Wednesday as a stand-in for President Milos Zeman.

The assembly will also be attended by Japan’s new foreign minister, Toshimitsu Motegi, who will be in New York from September 22-28. He said a meeting with his South Korean counterpart was not planned. Ties between the two neighbors soured this year over wartime forced labor.

Trade wars, migration, energy supplies, climate change and the eradication of poverty underpin the basic themes of the 193-member General Assembly agenda.

The White House said U.S. President Donald Trump on Monday will host a meeting on the Global Call to Protect Religious Freedom and is not scheduled to attend the climate summit.

Trump has announced that the United States was ending participation in the Paris Agreement. However, many U.S. states, municipalities, and businesses are continuing to abide by the Paris accord.

On Tuesday, Guterres and the president of the 74th session of the General Assembly, Tijjani Muhammad-Bande, will deliver opening remarks at the General Debate, followed by a probably eye-catching speech by Trump.