Spain accused Britain on Friday of "unacceptable interference" for launching a diplomatic protest over a maritime dispute off the contested British territory of Gibraltar.
It was the latest in a long string of diplomatic skirmishes over the tiny Mediterranean peninsula which has been governed by Britain since 1713 but is claimed by Spain.
Britain summoned Spanish ambassador Federico Trillo on Thursday alleging that a Spanish navy ship on July 16th tried to divert two commercial vessels heading to Gibraltar by wrongly claiming they were in Spanish waters.
The Spanish foreign ministry retaliated by summoning the British ambassador in Madrid, Simon Manley, it said in a statement after the meeting on Friday.
The Spanish ministry insisted the ships had been in Spanish waters and said the Spanish navy acted legally. It criticized London for repeatedly summoning Trillo over Gibraltar in recent months.
"This latest incident represents unacceptable interference by the United Kingdom in the routine activities of the Spanish navy in Spanish waters, especially since none of the vessels was British-flagged," the statement said.
After the meeting, the UK Ambassador to Spain Simon Manley tweeted the following message.
I have reiterated to the Spanish MFA the concerns expressed by the FCO over Spanish naval activity in the high seas + cont'd border delays
— Simon Manley (@SimonManleyFCO) July 18, 2014
Wednesday's incident saw Ambassador Federico Trillo hauled in for the fifth time since 2011 over the long-running dispute over the tiny British peninsula off the southern coast of Spain.
Prime Minister David Cameron also raised the incident with his Spanish counterpart Mariano Rajoy on the sidelines of a European leaders' summit in Brussels on Wednesday.
"I am extremely concerned by the actions of a Spanish Navy vessel which sought to redirect two commercial vessels heading to and from the Port of Gibraltar, wrongly claiming they were in Spanish waters," Lidington said.
"The vessels were in international waters off Gibraltar, and the actions of the Spanish Navy vessel constitute a breach of the UN Convention on the Law of the Sea."
He said it was a "cynical attempt by the Spanish government to disrupt Gibraltar's economy, in contravention of international law.
Spain ceded Gibraltar to Britain in perpetuity in 1713 but has long argued that it should be returned to Spanish sovereignty, and the territory remains a source of diplomatic tensions.
Relations between London and Madrid became particularly strained last year after Gibraltar dropped 70 concrete blocks into the sea in July, in what its government said was an attempt to create an artificial reef.
The move had the effect of also blocking Spanish fishing boats from operating close to the airport runway, and Madrid responded by introducing stringent border checks.