Donald Trump is preparing to start a war against Cuba after growing frustrated that his intimidation tactics against the country’s communist regime aren’t working, according to a report.

The president, who is already in the midst of a deeply unpopular conflict in Iran, is weighing whether to launch military action against Havana to force through his hopes for regime change in Cuba, according to Politico.The Trump administration has long toyed with the idea of attacking Cuba. Discussions have intensified as the economic pressure the U.S. piled on the country—including cutting off oil supplies from Venezuela following the capture of the South American country’s former leader Nicolás Maduro—is not having the desired effect.

“The mood has definitely changed,” a source told Politico. “The initial idea on Cuba was that the leadership was weak and that the combination of stepped-up sanctions enforcement, really an oil blockade, and clear U.S. military wins in Venezuela and Iran would scare the Cubans into making a deal.

“Now Iran has gone sideways, and the Cubans are proving much tougher than originally thought. So now military action is on the table in a way that it wasn’t before.”