Russian intelligence agencies have grown more aggressive in their efforts to steal Western technology and defense secrets as sanctions squeeze the country’s wartime economy.

Ukrainian President Volodymyr Zelenskyy has written to U.S. President Donald Trump and Congress asking for more air defense ammunition.

Britain's cyberspying chief has warned that artificial intelligence is becoming an “unstoppable force” weaponized just below traditional warfare levels.

Britain’s government has approved a massive new Chinese Embassy in central London, despite strong criticism from lawmakers.

Britain's spy agency is celebrating the festive season with a riddle wrapped in an enigma inside a mystery.

The U.K. has named the first woman to head its communications intelligence agency.