The Operational Command in Warsaw made the announcement on Saturday morning.
Polish Army officials said that over the past hours, there had been stepped up activity of the long-range aircraft of the Russian Federation, designed to carry out rocket strikes on targets located on the territory of Ukraine.
Later on Saturday, Polish military authorities said that planes protecting its airspace had returned to base after the threat level had reduced, Poland's PAP news agency has reported.
Russia launched dozens of attacks over Ukraine overnight, the Ukrainian air force said Saturday, as Kyiv pushes for more air defence.
"A total of 40 means of enemy air attack were recorded," it added, claiming it destroyed eight missiles.
Ukraine's air force said Russia attacked with a wide-range of weapons including cruise, ballistic, anti-aircraft missiles as well as drones.
Shelling wounded one civilian in Beryslav, on the shores of the Dnipro river in southern Kherson, on Friday evening.
Authorities have not yet reported any fatalities.
(mo)
Source: PAP, Reuters, Polish Army