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 ...

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

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

Secretary of State Marco Rubio says the U.S. may withdraw from mediation talks with Ukraine and Russia if President Donald ...

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

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

Ukraine peace talks are teetering on the brink of chaos today after Marco Rubio snubbed a London summit with allies. The US ...

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