The Operational Command of Poland's Armed Forces said it had deployed "all necessary forces and resources at its disposal" as a preventive measure to ensure the safety of Polish airspace amid Russian attacks on Ukraine.
It added that it was "monitoring the situation on an ongoing basis."
Military aircraft were activated, the Operational Command said in a statement, adding that measures were taken to ensure security in areas near the Ukrainian border.
"Ground-based air defence systems and radar reconnaissance have been placed on alert," the army said on its social media channels.
At around 9 a.m., the Operational Command said the threat of Russian strikes on regions bordering Poland had decreased and that military aircraft were returning to base.
"Activated ground-based air defence and radar reconnaissance systems have returned to standard operational activities," it said.
It reported no violations of Polish airspace during the attacks.
Polish airports in Lublin and Rzeszów temporarily suspended flight operations due to the activation of military aircraft, the Polish Air Navigation Services Agency (PANSA) said on X.
The two airports in eastern Poland later resumed flights, the air traffic authority said.
Russia launched a new wave of air strikes on Ukraine on Friday morning, striking targets across the country, according to reports.
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Source: IAR/PAP