(Bloomberg) — Volodymyr Zelenskyy said he’ll speak by phone with Donald Trump on Wednesday, a day after the U.S. president’s conversation with Vladimir Putin failed to win Russia’s commitment to a 30-day ceasefire in Ukraine.

Speaking to reporters in Helsinki on Wednesday, the Ukrainian president struck a defiant tone saying his country will never recognize the territories currently occupied by Moscow as Russian. He also insisted that the size of his army shouldn’t be a subject for talks with Putin.