Ukraine's leader Volodymyr Zelensky said Saturday he was ready to take Donald Trump to the frontlines, as fears grow over sustained US aid to Kyiv should the ex-president return to the White House.

Zelensky told the Munich Security Conference he had invited Trump to Ukraine because policy makers should see what real war entailed.

"If Mr Trump will come, I’m ready to go with him to the frontline," said the Ukrainian president.

"I think if we’re in dialogue how to finish the war, we have to demonstrate to people who are decision makers what does it mean the real war, not in Instagram. Real war," said Zelensky in English.