President Donald Trump said US forces would destroy any Iranian “fast attack ships” that approach the American naval blockade of Iranian ports that came into effect on Monday.

“Warning: If any of these ships come anywhere close to our BLOCKADE, they will be immediately ELIMINATED,” Trump said on his Truth Social network, adding that the rest of Iran’s navy had been “completely obliterated.”

The US military would be “using the same system of kill that we use against the drug dealers on boats at Sea,” the president said, referring to air strikes on alleged narcotics boats off the coast of Venezuela.

Earlier on Sunday Trump said the US ​Navy would immediately start blockading the ‌Strait of Hormuz and would also interdict every vessel in international waters that had paid ​a toll to Iran.

Trump made his ​remarks in a Truth Social post ⁠hours after US-Iran peace talks ended without a ​deal. Trump said the meeting “went well, most ​points were agreed,” but added the two sides had not agreed on Iran’s nuclear program.

 “Effective immediately, the ​United States Navy, the Finest in ​the World, will begin the process of BLOCKADING ‌any ⁠and all Ships trying to enter, or leave, the Strait of Hormuz,” said Trump, who is strongly opposed to the ​idea of ​Iran charging ⁠ships a toll to pass through the strait.

 “I have also ​instructed our Navy to seek and ​interdict ⁠every vessel in International Waters that has paid a toll to Iran. No one ⁠who ​pays an illegal toll ​will have safe passage on the high seas,” he ​said.

The US military’s regional Central Command said the blockade would start at 10 a.m. ET (1400 GMT) on Monday, to be “enforced impartially ⁠against vessels of all nations” entering or leaving Iranian ports in the Gulf and the Gulf of Oman.

Two Iranian-linked tankers, the Aurora and New Future, laden with oil products, left the strait on Monday before the US blockade was due ​to take effect, according to LSEG data.

An Iranian military spokesperson called any US restrictions on international shipping “piracy,” warning that if Iranian ports were threatened, no port in the Gulf or Gulf of Oman would be secure. Any military vessels approaching ​the strait would violate the ceasefire, Iran’s Revolutionary Guards said.