Secretary of State Marco Rubio is casting new doubt on NATO's relevance after key allies recoiled from backing Washington’s “Operation Epic Fury.”

US Secretary of State Marco Rubio will attend NATO talks in Sweden this week amid concerns over President Donald Trump’s Europe troop reduction plans, the Iran war and rising…

US Secretary of State Marco Rubio heads to Sweden on May 21 for a meeting of NATO foreign ministers as European allies seek reassurances over US troop drawdowns and Washington's…