Ukraine and Russia have escalated their shadow war of espionage, sabotage, and assassinations, with both countries claiming a growing list of captured agents, intercepted plots, and cross-border attacks.

Ukraine's top military spy says the country has spies inside the Kremlin. The defense intelligence chief predicts 'wins' in war with Russia 'obvious to world community' by mid-August.

Ukrainian Security Service says two Russian FSB agents suspected of killing Colonel Ivan Voronych on July 10 have been "neutralized" in Kyiv Oblast.

The chief of Britain’s foreign intelligence service believes that Russia is losing steam in its invasion of Ukraine, and has lost its ability to spy in Europe “by half” following the ...

A retired lieutenant colonel pleaded guilty to conspiring to transmit classified information on a dating site to what he believed was a Ukrainian woman.

Flight data showed how American and British reconnaissance aircraft flew from England toward Russia on Monday.

North Korea is now supplying as much as 40% of Russia’s ammunition for the war in Ukraine as the partnership between Pyongyang and Moscow deepens, according to the head of Ukrainian military intelligence.

How the war in Ukraine impacted David McCloskey's Russia spy thriller NPR's Mary Louise Kelly talks with David McCloskey, whose new spy versus spy novel Moscow X is about a CIA officer scheming to ...

KYIV, Ukraine — Ukrainian counterintelligence investigators have foiled a Russian plot to assassinate President Volodymyr Zelensky and other top military and political figures, the Security ...