NATO `vigilant` over Russian warplane activity in Europe airspace

NATO chief Jens Stoltenberg said Thursday that the transatlantic alliance remained vigilant over increased Russian military activity in European airspace.

Oslo: NATO chief Jens Stoltenberg said Thursday that the transatlantic alliance remained vigilant over increased Russian military activity in European airspace.

"NATO is strong, it remains vigilant," he said during a visit to Athens.

"This strength is our answer" to what NATO has termed large-scale Russian military manoeuvres over the Baltic Sea, North Sea/Atlantic Ocean and the Black Sea earlier this week.