BEIJING -- UN Secretary-General Antonio Guterres will meet Russian President Vladimir Putin and Ukrainian President Volodymyr Zelensky on April 26 and 28 respectively, a UN spokesman said Friday.

Guterres will visit Moscow on April 26 and have "a working meeting and lunch" with Russian Foreign Minister Sergei Lavrov, said Stephane Dujarric, spokesman for Guterres.

During his trip to Ukraine, Guterres will also have a working meeting with Ukrainian Foreign Minister Dmytro Kuleba and meet with staff of UN agencies to discuss the scaling up of humanitarian assistance to Ukrainian people, Dujarric said.

The UN chief sent separate letters Tuesday afternoon to the permanent missions of Russia and Ukraine to the United Nations, asking Putin to receive him in Moscow and Zelensky to receive him in Kyiv, Dujarric said on Wednesday.