Poland and Romania scrambled Nato fighter jets early on Wednesday as a series of explosions rang out across western Ukraine.In Poland, two airports in its southeast were shut down as Russian airstrikes targeted the cities of Lviv and Ternopil.

Officials said the two suspects left Poland and crossed into Belarus as soon as they committed the weekend attack on a rail line linking Warsaw with the Ukrainian border.

Poland ordered the closure of two other Russian consulates in recent years. The consulate in Krakow was closed earlier this year after Poland determined that a fire that destroyed a shopping center in Warsaw in 2024 was the result of arson ordered by Russian intelligence service.

An explosion that damaged a Polish railway track on a route to Ukraine was an “unprecedented act of sabotage,” Prime Minister Donald Tusk said on Monday.

Polish Prime Minister Donald Tusk said two Ukrainian citizens working for Russia are suspected of blowing up a railway line in Poland over the weekend.

In what Prime Minister Donald Tusk called an “unprecedented act of sabotage," a segment of a rail line linking Poland's capital, Warsaw, to the border with Ukraine was blown up over the weekend. Another segment further south was also damaged in what officials say was likely sabotage as well.

Poland accuses Russian intelligence of orchestrating a sabotage attack on a key railway used for transporting military aid to Ukraine, prompting heightened security measures.

Two devices on a main supply line to Ukraine were intended to derail passing trains but failed, the prime minister said, and the two suspects fled the country.