Russia’s TASS news agency, citing a spokesman for the country’s Black Sea Fleet, announced the news on Thursday, adding that the air-to-air missile systems had been deployed in Djankoy in northern Crimea.
Ties between Moscow and the rest of Europe have deteriorated since 2014, when Crimea rejoined Russia.
The rejoining of Crimea to Russia came following deep political changes in Kiev where a pro-Western movement staged weeks of street protests that led to the ouster of the pro-Russia government.
People in Crimea and in the industrial eastern territories of Ukraine, areas which are dominated by ethnic Russians, effectively refused to endorse the new administration in Kiev. Crimea decided to rejoin Russia in a referendum in March 2014 and two provinces in the east revolted by establishing self-declared republics.
Pro-Russians have turned the two regions of Donetsk and Lugansk in the east — collectively known as the Donbass — into self-proclaimed republics.
The West and Kiev lambast the reunification as annexation of the territory by Russia, accusing Moscow of having a hand in the bloody conflict in eastern Ukraine. Moscow, however, strongly dismisses both accusations.
On Wednesday, RIA Novosti news agency reported that the new S-400 missile systems would be operational by the end of the year. Footage released on Wednesday showed the new missiles participating in drills at the Kapustin Yar test range in Astrakhan region.
According to the Russian Defense Ministry, the S-400 systems practiced destroying low-flying, high-speed, highly maneuverable targets, relocating after completing combat missions, countering diversion groups, and moving through contaminated areas.
On Sunday, Russia’s naval forces intercepted and seized three Ukrainian vessels after they illegally entered Russian waters off the coast of Crimea in the Sea of Azov, further complicating the already strained Moscow-Kiev relations.
The Kremlin has said the seizure of the ships and their crews was lawful because they were trespassing, a charge Ukraine strongly rejects.