Half of Warsaw city centre is closed to normal traffic on 8 July, while police sirens wail back and forth and helicopters criss-cross the sky ahead of a NATO summit designed to show solidarity against Russian aggression. The security operation involves more than 6,000 police officers as part of summit preparations costing 40 million euro.
EUobserver: NATO makes show of solidarity in Poland
A security guard is pictured near the National Stadium, the venue of the upcoming NATO summit, in Warsaw, Poland, on July 7, 2016.
