The spies were thought to be “involved in the invasion” of Ukraine. The massive and embarrassing security blunder is the latest in Russia’s faltering invasion. In total, the details of 620 Russians working for the FSB spy agency “involved in criminal activities” were released by the Main Intelligence Directorate of Ukraine. Many of the spies can be traced back to their work addresses, based at the Federal Security Service’s, FSB, Lubyanka headquarters in Moscow.

The mobile phone numbers and car licence plates of the names leaked have been revealed by the Ukrainians. Putin is a former KGB agent and retains close ties to the FSB.

The leak comes after Ukraine intercepted a call between two FSB agents.

The agents were discussing the death of Major General Vitaly Gerasimov.

The agent’s phone calls were easily picked up by Ukrainian intelligence,

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This was after Russia took out their own secure communications systems by destroying 3G towers in Ukraine.

Moscow has failed to recognise the resistance Russian forces would face in Ukraine.

The news comes as Ukraine has recaptured one of the first towns to fall to the Russian invaders.

Ukrainian soldiers recaptured the town of Trostianets with local reports stating that tanks, lorries and howitzers have been seized in the area. The town is 14 miles from the Russian border.

Moscow’s initial multi-front invasion plan has failed in the face of dogged resistance from Ukraine.

Russia has already refocused its efforts on the east, recognising that its forces were too spread out.

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