Moscow

April 30 (UPI) — Britain has expelled a Russian diplomat in retaliation for Moscow doing the same last month to a British official it accused of spying.

The tit-for-tat expulsions come as tensions rise between the two countries, with Britain accusing Russian submarines and undersea naval units in recent weeks of operating in and around British waters.

Britain’s Foreign, Commonwealth and Development Office announced the unidentified Russian diplomat’s expulsion Wednesday in a statement, saying it had summoned Russian Ambassador to Britain Andrei Kelin to inform him of the “reciprocal action.”

“Russia’s repeated unprovoked and unjustified actions are designed to disrupt our diplomatic work and form part of a wider campaign of aggressive behavior toward the U.K.,” the office said.

“Any further action by Russia will be treated as an escalation and met with a firm and proportionate response.”

UPI has contacted the Russian Embassy in London for comment.

The expulsion is in response to Russia expelling a British diplomat late last month who the Federal Security Service accused of being a British intelligence agent involved in “intelligence and subversive activities on Russian territory.”

The FSB identified the diplomat as Albertus Gerardus Janse van Rensburg, second secretary of the British Embassy in Moscow, stating he attempted to “obtain sensitive information during informal meetings with Russian economic experts.”

Britain’s foreign office on Wednesday condemned Russia’s “unjustified decision” to expel Janse van Rensburg and “the malicious public smear campaign that followed.”

“This behavior is wholly unacceptable, and we will not tolerate harassment or intimidation of our diplomatic staff,” it said.

The expulsion comes two weeks after Britain announced on April 9 that it had detected a Russian attack submarine entering international waters in the High North to distract from undersea naval units conducting “nefarious activity over critical undersea infrastructure elsewhere.”

The operation occurred several weeks before the announcement. Britain said the activity targeted subsea fiber-optic cables, which carry more than 99% of international data traffic, including voice calls and Internet data.

British and allied military assets were deployed, forcing the Russian GUGI units and Akula-class submarine to retreat, the Ministry of Defense said.

Kremlin spokesperson says talks are part of ‘​necessary dialogue’ with Washington as war in Ukraine continues for a fifth year.

A delegation of Russian officials has arrived in ‌the United States for meetings with their American counterparts.

The visit, which began on Thursday, marks the first such trip since ⁠relations strained over Moscow’s war in Ukraine.

Kremlin spokesperson Dmitry Peskov said, “We hope that these first tentative steps will, of course, make their contribution to the further revival of our bilateral engagement.”

He said President Vladimir Putin had set the “main directives” for the trip and would be “thoroughly briefed” on the meeting.

The visit comes as US-brokered talks seeking a deal to end the war in Ukraine are in effect frozen.

Several rounds of negotiations since US President Donald Trump returned to the White House last year have failed to break the deadlock, with the Kremlin ruling out compromises to halt its years-long offensive.

Russia, a close ally of Iran, has also been cited by Western intelligence officials as one of the backers of the Iranian government, as Tehran fights a war launched by the US and Israel.

A report in the United Kingdom-based Financial Times newspaper on Wednesday alleged that Russia was close to completing a shipment of drones to Iran.

Responding to questions about the report, Peskov said, “There are so many lies being spread by the media … Do not pay attention to them.”

Russia this week carried out one of the largest aerial attacks since the start of its war on Ukraine, launching 948 drones in 24 hours as it moved troops and equipment to the front line.

Ukraine’s President Volodymyr Zelenskyy issued a new appeal for allies to supply Kyiv with air defence munitions, warning that Kyiv, which relies on the US for air defence systems against ballistic missiles, will face a deficit of missiles while Washington is focused on the US-Israeli war on Iran.

Talks between Ukraine and the US that opened in the US state of Florida on Saturday again failed to produce a security guarantee that Kyiv has long sought from Washington.