Update(1450ET): White House Press Secretary Karoline Leavitt in a Tuesday afternoon press briefing confirmed that the US has ruled out sending American troops to uphold a future potential peace deal to end the Ukraine war based on 'security guarantees'. However other military options haven't been ruled out. For example, she told reporters that US air support in Ukraine could be part of security assurances amid peace talks with Russia. 

The US administration...

has "definitively ruled out" sending US troops to Ukraine as part of any security guarantees to bring about a peace deal with Russia, but she did not rule out other military options, including in the skies.

"It is an option and a possibility. I won't certainly rule out anything as far as military options that the president has at his disposal. I'll let him do that. I can tell you he's definitively ruled out boots on the ground," Leavitt said at the White House press briefing, when asked about the US providing "air" options as a form of security for Ukraine.

"The president understands security guarantees are crucially important to ensure a lasting peace, and he has directed his national security team to coordinate with our friends in Europe and also to continue to cooperate and discuss these matters with Ukraine and Russia as well," Leavitt said.