The fourth battalion of Russia's S-400 Triumph air defence missile systems has been put into active service in Crimea near the Russian-Ukrainian border, Russian Black Sea Fleet Information department dead Alexey Rulev said.
'Today, in Dzhankoy, units of the S-400 Triumph air defence missile system were put into active service to ensure air defence of Crimea', Sputnik cited Rulev as saying.
The move comes amid an escalation of tensions between Ukraine and Russia after the incident, involving Ukrainian vessels illegally crossing the Russian border at Kerch Strait.
Earlier in September, a law enforcement source reported that the fourth battalion of S-400s would be deployed to Crimea near the town of Dzhankoy while the Russian Black Sea Fleet said in a statement that the third battalion of S-400s was put into active service in the Crimean city of Yevpatoria.
