Russia's military defence has taken to the skies for a massive - and unexpected - air force exercise. In a sign of ongoing tensions over Ukraine, 250 aircraft and 12,000 service personnel are involved in the drill, according to its defence ministry.
Russia's military defence has taken to the skies for a massive - and unexpected - air force exercise. In a sign of ongoing tensions over Ukraine, 250 aircraft and 12,000 service personnel are involved in the drill, according to its defence ministry.