Secretary of State Marco Rubio told European counterparts Thursday the US will participate in post-war security guarantees for Ukraine but that the Trump administration believes Europe should take the lead,

Military chiefs from the United States and a number of European countries on Thursday presented options to their national security advisers for providing security guarantees to Ukraine, officials said.

Trump's transactional diplomacy could involve Europe paying up to $90 billion to ensure U.S. assistance to avoid another Russian invasion of Ukraine.