Poland put its military aircraft on heightened readiness on 23 Jan. for the second time, after detecting an unknown object that had flown into Polish airspace during Russia’s massive attack on Ukraine on 29 Dec.
From: Euromaiden Press BY MARIA TRIL

Poland has raised its military aircraft readiness amid the Russian morning missile attack on Ukraine, the Operational Command of Polish Armed Forces reportedon 23 January.
“We are observing the intense activity of the Russian Federation’s long-range aircraft, which is connected to the intention to carry out strikes on the territory of Ukraine,” said the statement. “The situation is being monitored on a current basis.”
According to the Operational Command of Polish Armed Forces, Polish and allied air forces have been activated, “which may be associated with the occurrence of an elevated noise level, especially in the southeastern part of the country.”
On 2 January, during a Russian massive missile long-range attack on Ukraine, Poland scrambled F-16 fighter jets to “ensure the security of Polish airspace” for the first time.
The decision was made following the Russian forces’ attack on Ukraine on 29 December 2023. Then, the Polish Operational Command detected an unknown object that flew in from Ukrainian territory near the Ukrainian border in the Zamość area of Poland.