The country's flight control center spotted the object before it disappeared from radar screens near the city of Rypin. Poland is on alert for any breaches of its airspace as war rages in neighbouring Ukraine and after rocket landings in November and December.
Authorities in Russia or Belarus could not be reached for comment. National security has become a key issue in Poland ahead of elections later in the year. The ministry said radar communication was cut near the town of Rypen in north-central Poland.