Russia is deploying long-range S-400 missile systems in Crimea amid heightened tensions with Ukraine, Russian state news agency TASS reported Friday.
The S-400, a surface-to-air missile system that can hit targets up to 400 kilometres away with an altitude of up to 30 kilometres, is one of the most advanced in the Russian arsenal.
The Russian military plans to showcase such systems during a series of exercises called Caucasus-2016, scheduled for next month.
Earlier this week, Russian President Vladimir Putin vowed to ensure the security of Crimea on allegations that Ukrainian military forces were planning to blow up critical infrastructure on the peninsula.
Ukraine has adamantly denied such allegations, with Ukrainian President Petro Poroshenko calling them "preposterous" and putting his country's military on combat alert.
Russia occupied and annexed Crimea two years ago in response to Ukraine ousting its pro-Russian president amid mass protests calling for closer ties with the West.