United States has expelled 15 Cuban diplomats to protest Cuba's failure to protect staff at the U.S. embassy in Havana from a mysterious spate of health attacks, spurring new tensions between the former Cold War foes. Secretary of State Rex Tillerson said the expulsions from Cuba's embassy in Washington were also intended to ensure equity in staffing levels, after he recalled more than half the U.S. diplomatic personnel in Havana on Friday.<br/><br/>Cuban Foreign Minister Bruno Rodriguez denounced the decision as unjustified, unfounded and unacceptable. He accused the United States of insufficient cooperation with Cuba's investigation of the health incidents and urged Washington to stop politicizing the matter.<br/><br/>The steps taken by President Donald Trump's administration delivers another blow to his predecessor Barack Obama's policy of rapprochement, including actions likely to erode the normalization of a relationship dominated for decades by mutual hostility and suspicion.