The Operational Command of Poland's Armed Forces said in a statement that "all necessary procedures have been initiated" to ensure the safety of Polish airspace.
It added that it was "monitoring the situation on an ongoing basis."
The statement also said that Polish and allied aircraft were activated early on Thursday, with the Operational Command taking steps to ensure safety in areas near the Ukrainian border.
The alert was in effect until around 8 a.m., when the Operational Command noted a decreased threat of Russian strikes on Ukrainian regions bordering Poland.
The Operational Command reported no violations of Polish airspace during the Russian air strikes on Ukraine.
"It was another night of heightened readiness for Polish and allied forces, with radio engineering units, pilots, ground crews and duty personnel working intensively," the Operational Command said.
“We thank NATO Air Command and the Swedish air force for their support," it added. "Swedish JAS 39 Gripen fighter jets helped ensure the safety of Polish airspace this morning."
Russia launched a fresh wave of missile and drone strikes on Ukraine overnight into Thursday, targeting various regions across the country, including the western city of Lviv near the Polish border, according to officials.
Ukraine's air force said that Russia used 574 drones and 40 missiles in the overnight attack on the country.
Russia strikes US electronics manufacturer in western Ukraine: FM
Ukrainian Foreign Minister Andrii Sybiha said the Russian attack struck an American electronics manufacturer in western Ukraine, causing serious damage and casualties.
"A fully civilian facility that has nothing to do with defense or the military," Sybiha wrote on X. "This is not the first Russian attack on American businesses in Ukraine, after strikes on Boeing offices in Kyiv earlier this year and other attacks."
He added that Russia used hundreds of drones, hypersonic, ballistic and cruise missiles in the countrywide attack.
Russia launched a full-scale invasion of Ukraine on February 24, 2022, starting the largest armed conflict in Europe since World War II.
Thursday is day 1,275 of the war.
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Source: IAR, PAP, polskieradio24.pl, Ukrinform, Reuters
Click on the audio player above for a report by Marcin Matuszewski.