Secretary Rubio’s new role as national security adviser may be unsustainable, according to foreign policy experts.

Secretary of State Marco Rubio indicated Thursday that a peace deal between Russia and Ukraine is still on the horizon but ...

FOX News host Sean Hannity asked Secretary of State Marco Rubio for an update on U.S. attempts to get Russia and Ukraine to ...

Ukraine wants to hold another meeting of national security advisors with the participation of the United States, Britain, ...

U.S. Secretary of State Marco Rubio stated Ukraine cannot force Russia to retreat to its 2014 borders, signaling a potential ...

The decision by Secretary of State Marco Rubio to pull out of the meeting and an objection by Ukraine’s leader to a key U.S.

Talks between the U.S., Ukraine and European officials to discuss ending Russia's war in Ukraine faltered as Secretary of ...

"This is a critical moment for Ukraine, Britain and Euro-Atlantic security," British Foreign Minister David Lammy said on ...

A recent conversation between U.S. Secretary of State Marco Rubio and Russian Foreign Minister Sergey Lavrov signals a ...

Marco Rubio was just two weeks into his new job when he got a critical lesson in being President Donald Trump’s secretary of ...

The Secretary of State's comments came after President Donald Trump questioned whether Russian President Vladimir Putin wants ...

Fox & Friends co-host Brian Kilmeade took a jab at Secretary of State -- and newly-minted National Security Adviser -- Marco ...