“Energy is the chokehold to kill” the Cuban regime, said a person familiar with the discussions. The Trump administration is weighing new tactics to drive regime change in Cuba, including imposing a total blockade on oil imports to the Caribbean country, three people familiar with the plan said Thursday. That escalation has been sought by some critics of the Cuban government in the administration and backed by Secretary of State Marco Rubio, according to two of the three people, who were granted anonymity to discuss the sensitive discussions. No decision has been made on whether to approve that move, but...