Former British Prime Minister David Cameron
© Kacper Pempel / ReutersFormer British Prime Minister David Cameron
U.K. foreign secretary's words confirm London's growing involvement in military operations on the side of Kyiv, according to the Kremlin.

"The ambassador was called upon to reflect on the inevitable catastrophic consequences of such hostile steps by London and to immediately refute the belligerent provocative statements of the head of the Foreign Office in the most decisive and unequivocal way," the ministry said.

Cameron told Reuters last week that Ukraine has the "right" to use British-supplied weapons to strike Russia inside its own territory.

"Russian side views Cameron's words as evidence of a serious escalation and confirmation of London's growing involvement in military operations on the side of Kyiv," according to the Russian foreign affairs ministry.

Relations between the U.K and Russia have worsened since Moscow launched its full-scale invasion of Ukraine in February 2022, prompting London to impose sanctions on Moscow.

Earlier on Monday, Russia announced it has started preparing for nuclear weapons exercises, accusing Western officials of making "provocative statements and threats" by deepening their support for Ukraine.