Former National Security Advisor Jake Sullivan disputes Secretary of State Marco Rubio's characterization that continuing negotiations with Russian President Putin are a step toward ending the war in ...

MOSCOW/WASHINGTON - Russia has massed enough troops near Ukraine to launch a major invasion, Washington said on Friday, as it urged all U.S. citizens to leave the country within 48 hours after Moscow ...

President Trump is meeting with Ukrainian President Volodymyr Zelenskyy at the White House today to discuss ending Russia's war in Ukraine. But former national security adviser Jake Sullivan says ...

Add Yahoo as a preferred source to see more of our stories on Google. ABC News’ Martha Raddatz interviews former Biden national security adviser Jake Sullivan on “This Week.” ...