British police have arrested three people on suspicion of assisting Russian intelligence services, highlighting the threat posed to NATO allies as Russia pursues hybrid warfare against Western powers.

Newsweek has contacted the Russian embassy in the U.K. for comment.

The arrests also coincide with U.S. President Donald Trump 's state visit to the U.K., a NATO ally, during which the topic of ending Russia's war in Ukraine is expected to be one of the top agenda items in bilateral talks with British Prime Minister Keir Starmer.

NATO allies have sounded the alarm over a rising number of Russian intelligence plots to carry out acts of sabotage inside their countries—some of which have been successful— as Moscow and the West clash over the war in Ukraine.

Russia denies orchestrating s

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