Mexico is weighing whether to halt or scale back oil shipments to Cuba as concerns grow within President Claudia Sheinbaum’s government that continuing the policy could trigger retaliation from the United States, according to sources familiar with internal discussions. The review comes at a sensitive moment. Venezuelan oil shipments to Cuba have stopped following U.S. intervention in Venezuela and the removal of Nicolás Maduro, leaving Mexico as Cuba’s most important remaining oil supplier. That shift has pulled Mexico directly…