US President Donald Trump has said the United States will not send ground troops to Ukraine for security guarantees after a ceasefire, but suggested a possibility of providing air support.

Trump made the remarks in a telephone interview with Fox News on Tuesday, a day after he met with Ukrainian President Volodymyr Zelenskyy, European leaders and others at the White House.

Trump was asked if there is a guarantee that the US will not deploy ground troops to defend the Ukrainian border.

He said, "You have my assurance -- and I'm President."

Trump also said Europe is willing to put people on the ground, while the US could play a support role especially in the air because no other country has such capabilities.

Zelenskyy suggested on Monday that a framework for security guarantees will be worked out within 10 days.