Russia's Federal Security Service (FSB) said on Thursday that it had foiled an attempt by Ukrainian special services to attack an oil and gas facility that supplies Turkey and Europe with energy.

"As a result of a complex of operational and search measures, the Russian FSB prevented an attempt by Ukrainian special services to commit a sabotage and terrorist act at an oil and gas facility that supplies energy to Turkey and Europe," the FSB said in a statement.

A man and four accomplices were detained. The man was recruited by the Ukrainian security services while the four accomplices were Russian citizens that played a significant role in the preparation for the terrorist attack.

No other information, such as the details of the operation nor the identity of the detainees, was disclosed.

An intelligence war

Earlier in September, Russia's Federal Security Service thwarted a series of terrorist attacks on the Kherson Region and Crimean authorities, gaining information on a foreign security operation.

On August 26, the Russian Federal Security Service (FSB) revealed that officers had detained a Ukrainian intelligence agent in Kursk for spying on military facilities.

"The unlawful activities of a resident of the city of Kursk, a Ukrainian citizen, who is an agent of the Main Directorate of Intelligence of the Ukrainian Ministry of Defense, suspected of involvement in the collection and transfer on the instructions of foreign intelligence of information about objects of the [Russian] defense ministry for use against the security of Russia, were stopped," the FSB said in a statement.

According to the statement, special technical tools given to him by the Ukrainian special agency were seized in his apartment.

Read more: Russia FSB: Ukrainian agent spying on military facilities detained