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.

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,

NATO Secretary-General Mark Rutte, who touted the guarantees with other European leaders when they conferred with President Donald Trump at the White House on Monday, was in Ukraine on Friday to lay out a framework to Ukraine's President Volodymyr Zelenskyy.