At 10 Downing Street in London, the Ukrainian President met with Britain's Prime Minister Keir Starmer on Thursday morning.
Later, a meeting with the new NATO chief Mark Rutte awaited.
In the afternoon, Zelenskyj continued to Paris for a meeting with French President Emmanuel Macron. Later, he headed to Rome for talks with Italian Prime Minister Giorgia Meloni.
On Friday morning, Zelenskyj has a scheduled audience with Pope Francis in the Vatican, and the same day, he will meet with German Chancellor Olaf Scholz in Berlin.
The planned support meeting for Ukraine at the US military base Ramstein in Germany had to be postponed since US President Joe Biden announced that he would stay home due to Hurricane Milton.
Any leader in similar circumstances would have stayed in their country, Zelenskyj said during a press conference during a visit to Croatia on Wednesday.
He further emphasized that the Ramstein format, with leaders gathered on site, is important and that a new date for the meeting can be found in the near future.
Zelenskyj is also determined to present his "victory plan" to the leaders participating when a new date is set.
The meeting in Ramstein is one of the recurring meetings of NATO countries and their allies on Ukraine and the war against Russia.
