Estonia has summoned Russia's ambassador over an airspace violation by a Russian military aircraft. Estonia's foreign ministry spokeswoman said violation was serious, adding that the Baltic country "demands an explanation" as to why a Russian Ilyushin-20 surveillance aircraft crossed into its airspace on October 21. The North Atlantic Treaty Organization, meanwhile, NATO said in a statement fighter jets from Denmark, Portugal, as well as non-NATO member Sweden were involved in intercepting the Russian aircraft as it flew over the Baltic Sea. It said the aircraft strayed some 600 meters into NATO airspace. Check out our website: uatoday.tv Facebook: facebook.com/uatodaytv Twitter: twitter.com/uatodaytv