Maduro said he was launching "a joint action of a defensive nature in response to the provocation and threat of the United Kingdom against peace and the sovereignty of our country."
Britain said Sunday it would divert the patrol vessel HMS Trent to Guyana, a former British colony, amid the South American country's simmering territorial dispute with neighboring Venezuela over the oil-rich Essequibo region.
A Guyana foreign ministry source, speaking on condition of anonymity, told AFP that the ship was due to arrive Friday and would be in its territory for "less than a week" for open sea defense exercises. The ship will not dock in Georgetown.
The television broadcast accompanying Maduro's announcement showed fighter jets participating in the Venezuelan exercise, as well as ships and ocean patrol vessels.
The Venezuelan government earlier asked Guyana, in a statement, "to take immediate action for the withdrawal of the HMS Trent, and to refrain from involving military powers in the territorial controversy."
Guyana's vice president Bharrat Jagdeo said the country was not doing anything to threaten Venezuela.
"A lot of these measures were long-planned and they are routine and they are part of our building a defensive capability," he told a press conference.
"We don't plan on invading Venezuela. President Maduro knows this and he need not have any worry about that."
'We are warriors'
Maduro claims that Essequibo -- which makes up about two-thirds of Guyana's territory -- is actually Venezuelan land, a decades-old contention that has flared since massive oil deposits were found in its waters.
The rising tensions have raised fears in the region of a potential conflict over the remote area of 160,000 square kilometers (62,000 square miles).
The South American neighbors agreed earlier this month not to resort to force to settle the dispute, during a meeting between Maduro and Guyana's President Irfaan Ali.
"We believe in diplomacy, in dialogue, in peace," said Maduro.
"But no one should threaten Venezuela, no one should mess with Venezuela. We are a people of peace, but we are warriors and this threat is unacceptable for any sovereign country," he said.
"The threat of the decadent, rotten, ex-empire of the United Kingdom is unacceptable."
A UK foreign minister, David Rutley, visited Guyana earlier this month and reiterated sovereign borders "must be respected" and that London would work internationally "to ensure the territorial integrity of Guyana is upheld."
Maduro's government held a controversial referendum on December 3 in which 95 percent of voters, according to officials in the hard-line leftist government, supported declaring Venezuela the rightful owner of Essequibo.
He has since started legal maneuvers to create a Venezuelan province in Essequibo and ordered the state oil company to issue licenses for extracting crude in the region.
Guyana's Ali has branded the moves a "grave threat to international peace and security."
https://www.france24.com/en/live-news/20231228-venezuela-launches-military-exercise-over-british-warship-threat