The United States on Thursday imposed ‌financial sanctions on a sprawling business conglomerate run by Cuba’s military and a Cuban-Canadian mining joint venture, as the Trump administration ramps up pressure on the island’s communist leaders by targeting sources of foreign investment.

After the military raid to seize the leader of longtime Cuban ​ally Venezuela in January, U.S. President Donald Trump has said that “Cuba ​is next,” and blocked most oil shipments to the country, worsening power outages on the island.

Trump last week signed an executive order broadening U.S. sanctions against Cuba, a ​move President Miguel Díaz-Canel decried as “coercive.”

Under that order, U.S. Secretary of State Marco Rubio said the Trump administration was ⁠targeting Grupo de Administracion Empresarial S.A. (GAESA), the military conglomerate ‌that U.S. officials say controls at least 40 per cent of Cuba’s economy, and its Executive President Ania Guillermina Lastres Morera.

Measures target Moa Nickel SA

The measures also targeted Moa Nickel SA, a joint venture between Toronto-based Sherritt International Corp and Cuba’s state-owned nickel company, which mines nickel and cobalt, Rubio said in ⁠a statement, accusing Cuba’s government of providing a platform for intelligence operations of nations hostile to the U.S.

Sherritt said in a statement on its website on Thursday that it had suspended its direct participation in joint ‌venture activities in Cuba, “effective immediately.”

The company says it’s taking steps to repatriate its expatriate employees in Cuba and has requested that its partners also repatriate their expatriate personnel in Canada.

Sherritt noted there is no immediate effect on refinery operations in Fort Saskatchewan, Alta., where it is continuing to produce finished nickel and cobalt. It says there is enough feed material to last until about mid-June.

U.S. pressure on Cuba

The U.S. has long demanded Cuba open its state-run economy, pay reparations for properties expropriated by the government of former leader Fidel Castro and hold “free and fair” elections.

Cuba has said its form of socialist government is not up for negotiation. Top Cuban ​officials accuse Washington of “hinting at a military action” to “liberate” Cuba, and say decades of U.S. sanctions against the island’s government are the root cause ⁠of its economic and social woes.

Rubio earlier this week held talks with military officials at the U.S. ⁠Southern Command in Florida, which oversees U.S. operations in the Caribbean region. He was photographed shaking hands ⁠with ⁠its commander, General Frank Donovan, standing ​before a map of Cuba.

“Today’s sanctions demonstrate that the Trump Administration will not stand by while Cuba’s communist ​regime threatens our national security in ⁠our hemisphere,” Rubio said on X. “We will continue to take action until the regime takes all necessary political and economic reforms.”

The sanctions came shortly after Rubio held talks at the Vatican with Pope Leo, who has raised concerns about rising tensions between the U.S. and Cuba and called for dialogue.