British police will now be able to stop, search and detain individuals at UK ports they suspect of being foreign spies or assassins.
From Thursday, fresh measures will allow specially trained officers to take action in relation to espionage and foreign interference.
The new "Schedule 3" powers are part of the UK's wider effort to tackle hostile state activity. Outlined in the Counter-Terrorism and Border Security Act 2019, the powers were created as part of the UK's response to the Salisbury nerve-agent attack in 2018.
Alleged Russian spies tried to assassinate former MI6 double agent Sergei Skripal and his daughter Yulia in the Wiltshire city.
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