Kathmandu. US Secretary of State Marco Rubio has stated that Cuba poses a 'national security threat' to the United States and that the possibility of a peaceful agreement is 'not high'. Rubio's strong remarks came a day after the US filed a lawsuit against former Cuban President Raul Castro on charges of killing American citizens by shooting down two planes in 1996.Speaking to reporters on Thursday, Rubio stated that Washington's priority is 'diplomatic solution' but warned that President Donald Trump has the right and responsibility to protect his country from any threat. He also accused Cuba of being one of...