The spokesman said there was no particular reason for concern over Russian warplanes exercising their right to fly in international air space but that such sorties were shadowed by Nato aircraft as a precaution and to protect civil air traffic.
[source : Nato jets intercept Russian warplanes following 'unusual level of air activity', The Guardian, http://www.theguardian.com/world/2014/oct/30/nato-jets-intercept-russian-warplanes, 30th October 2014]
So Russia had not invaded NATO airspace, as implied by the reports, but was instead flying in international airspace but a little further South than usual, and NATO did not intercept but merely shadowed the planes.
Phew!! World War 3 averted by NATO, who support neo-Nazis in Ukraine and international cutthroat Jihadis in Syria.
So what provoked this media hysteria?