Poland deploys planes due to threat of drone strikes in nearby Ukraine

Preventive operations' included putting air defence systems on high alert and followed serious Russian incursion earlier in the week

Polish and allied aircraft have been deployed in a preventive" operation in Poland's airspace because of a threat of drone strikes in neighbouring areas of Ukraine, and the airport in the eastern Polish city of Lublin was closed, authorities have said.

The alert on Saturday lasted about two hours. On Wednesday multiple Russian drones had crossed into Poland, prompting Nato to send fighter jets to shoot them down, underlining long-held concerns about the expansion of Russia's more than three-year war in Ukraine.