On May 19 NATO Air Policing fighter aircraft were scrambled to intercept one AN-26 flying in international airspace from the mainland of the Russian Federation to Kaliningrad. Its onboard transponder was switched off. The crew had no flight plan but maintained radio communication with the regional air traffic control centre.
On May 20 NATO fighter jets were alerted to identify and escort one SU-30 flying from Kaliningrad and back through international airspace with its onboard transponder switched off, no pre-filed flight plan, not maintaining radio communication.
On May 20 NATO fighter aircraft were scrambled to intercept one SU-24M which flew into international airspace from Kaliningrad and later returned. Its onboard transponder was switched off, the crew had no flight plan and was not maintaining radio communication with the regional air traffic control centre.
On May 22 NATO fighter aircraft intercepted one SU-2 flying from Kaliningrad and back via international airspace with its onboard transponder not used, without the flight plan and not maintaining radio communication with the regional air traffic control centre.
On May 23 NATO fighter jets identified and escorted two SU-30s flying from the mainland of the Russian Federation to Kaliningrad through international airspace. Their onboard transponder was switched on, the crews maintained radio communication with the regional air traffic control centre but there was no plan pre-filed for the flight.
On May 24 NATO fighter jets were scrambled to intercept one IL-20 flying from the mainland Russia to Kaliningrad. Its onboard transponder was switched on, the crew was maintaining radio communication but had no flight plan.
On May 25 NATO fighter aircraft were scrambled to intercept two SU24Ms flying from Kaliningrad and back via international airspace without using the onboard transponders, no flight plan, and not maintaining radio communication with the regional air traffic control centre.
