A blackout has left millions of people without power in Havana and the rest of western Cuba in the latest outage on an island struggling with dwindling oil reserves and a crumbling electric grid.

Latest outage darkens island facing dwindling oil reserves and increasing pressure from Washington

Daily power outages of up to 20 hours are the norm in parts of the impoverished island, which lacks the fuel needed to generate power. The crisis has become more acute since the…