27."Together, we will secure peace through strength and make America ang the world safe again," Trump said on his social media network Truth Social.In June, Reuters reported that Kellogg and another Trump's top advisor, Frederick H. Fleitz, proposed him a plan that would cease military aid to Ukraine unless it agrees to hold peace negotiations with Russia. The two also reportedly proposed to freeze the front lines in their current position and take Ukraine's NATO accession off the table.Keith Kellogg, 80, previously served as the Executive Secretary and Chief of Staff of the U.S. National Security Council in the first Trump administration. He also was a top advisor to then U.S. Vice President Mike Pence.Last week, Reuters reported that Trump was considering his former intelligence director, diplomat Richard Grenell, as a special Ukrainian peace envoy.On the campaign trail, Trump promised to end Russia's war with Ukraine if elected, saying in September that he would negotiate a deal "that's good for both sides.