Peru has cancelled a visit by a Royal Navy frigate in a display of solidarity with Argentina over the Falklands.
HMS Montrose had been due to visit the country later this week, but the Peruvian government has now withdrawn its welcome for the ship.
Foreign Minister Rafael Roncagliolo said the decision had been taken "with regard to the legitimate rights of Argentina in the sovereignty dispute over the Falkland Islands, South Georgia and South Sandwich Islands".
The Foreign Office said Peruvian officials could have raised the issue with Foreign Office minister Jeremy Browne when he visited the country last week.
"HMS Montrose was scheduled to make a short visit to Peru as part of a routine deployment to the region," a spokesman said.
"This was agreed as an act of friendship and co-operation between Peru and the UK.
"Ship visits are a sovereign decision for states, but we regret that Peru has revoked its previous agreement to this visit.
"This is despite the Peruvian government having had the opportunity on Friday to raise any concerns it had about this agreed co-operation."
As Britain and Argentina prepare to mark the 30th anniversary of the Falklands War, Buenos Aries again has its sights on claiming the territory it calls Las Malvinas for itself.
Argentina has accused the UK of "militarising" the dispute by reportedly sending a submarine carrying nuclear weapons to the South Atlantic, something that Britain has not confirmed.
It also objected to the Duke of Cambridge's posting to the Falklands as an RAF search and rescue helicopter pilot.
And it further complained about the deployment to the region of one of the Royal Navy's most modern destroyers, HMS Dauntless.
Last week Argentina threatened to take legal action against British companies involved in oil exploration, a move dismissed by the Foreign Office as "wholly counter-productive".
In turn, Britain insists its movements of troops and warships are purely routine.
It claims Argentina is trying to impose an economic blockade on the Falklands by restricting shipping to and from the islands.
