Prime Minister Andrej Babis will attend the United Nations General Assembly in New York this week.
Babis said he has scheduled a meeting with Ukrainian President Volodymyr Zelensky 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.
Trade wars, migration, energy supplies, climate change and the eradication of poverty underpin the basic themes of the 193-member General Assembly agenda.