Cuba’s leader on Tuesday said the US would face “unbreakable resistance” if it tries to take over the impoverished island nation, as communist authorities scrambled to fix a nationwide electricity blackout.Cuba’s government has been under increasingly crushing pressure, with Washington enforcing an oil blockade and openly stating it wants to end the nearly seven-decade-old US stand-off with the one-party communist state.US Secretary of State Marco Rubio said Cuba’s decision announced this week...