Tests of Russia's S-500 air defence systems are almost completed, President Vladimir Putin said, adding that S-500 systems will be put into service of the Russian military after completion of tests. This reported by Sputnik.

"In the Aerospace Forces, about 70 percent of anti-aircraft missile regiments are re-equipped with modern S-400 systems, the next step is the supply of S-500 complexes to the troops, tests of which are already being successfully completed," Putin said, as broadcast by the Rossiya 24 TV channel.

The S-500 Prometey ("Prometheus") is a new generation surface-to-air missile system with a range of 400-600 kilometres (250-370 miles), designed for intercepting and destroying intercontinental ballistic missiles, as well as hypersonic cruise missiles and aircraft.