Boeing 737-783 registration LN-RPJ is not a regular airliner. It's a medevac airplane that transports wounded Ukrainian soldiers from the Polish border town of Rzeszów (RZE) to destinations around Western Europe. Here are articles that offer more context:
Today, LN-RPJ visited NUE, and I captured it with mixed feelings. On the one hand, it's a rare machine, so I'm glad I had a chance to photograph it. On the other hand, it made the war in Ukraine feel closer. There were ambulances and emergency services waiting on the apron, and the airplane was escorted by an Apache helicopter.
Fuck wars, and fuck those who wage them.