U.S. Ambassador to the United Nations Mike Waltz on Sunday labeled Cuba's communist government "a national security threat."

He accused China and Russia of maintaining intelligence operations on the island as the Trump administration intensifies pressure on Havana, The Hill reported Sunday.

Waltz said Cuba poses a direct security challenge to the United States because of the foreign military and intelligence presence just 90 miles off the Florida coast.

"The Cuban regime is not only a threat to its own people, it's a national security threat, and this administration's not going to stand for it any longer," Waltz told Fox News' "Sunday Morning Futures."

Waltz alleged that China and Russia continue to use Cuba as a hub for intelligence-gathering activities targeting the U.S.

"China and Russia are collecting information around our military bases in Cuba," he said, adding that both countries "still have intelligence posts, signals collection posts, and military officers in Cuba right off our shores."

He contrasted Cuba with other parts of Latin America where he said the Trump administration has rolled back the influence of U.S. adversaries.

"They're no longer in Venezuela. They're no longer in south Central America, in the way that they were, on the march, even in the Panama Canal, under the Biden administration and previous administrations," Waltz said.

The remarks come as the Trump administration has adopted an increasingly confrontational posture toward Cuba.

In May, CIA Director John Ratcliffe met with Cuban officials to deliver what the agency described as President Donald Trump's message that the U.S. is prepared to engage with Havana on economic and security issues only if the communist government undertakes what Washington considers fundamental reforms, The Hill reported.

Around the same time, Secretary of State Marco Rubio said he was skeptical that negotiations with Cuban officials would produce an agreement.

Tensions escalated further after Cuban President Miguel Diaz-Canel warned that any U.S. military intervention would result in "a bloodbath with incalculable consequences."

His comments followed an Axios report alleging Cuba possesses about 300 drones and has developed an attack plan targeting the U.S. naval base at Guantanamo Bay.

Former Florida Gov. Jeb Bush added to the administration's criticism last week, claiming Iran had supplied Cuba with the drones.