Move from Claudia Sheinbaum comes after Trump signed an order threatening tariffs on countries that sell oil to Cuba Move from Claudia Sheinbaum comes after Trump signed an order threatening tariffs on countries that sell oil to Cuba Mexico ’s president Claudia Sheinbaum has pledged to send humanitarian aid this week to Cuba and said Mexico was “exploring all diplomatic avenues to be able to send fuel to the Cuban people,” despite efforts from Washington to cut off oil to the Caribbean nation.