Polish officials have pointed the finger at Russia after a key train track was destroyed in what Warsaw said was an “unprecedented act of sabotage” committed by two Ukrainian citizens who were “collaborating with Russian services.

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.

There are warnings Russia is expanding its war, after an attack near the Ukraine-Romania border forced the evacuation of a village. And Poland is warning of sabotage on its railways. Catch up on the Ukraine war below.

NATO was forced to scramble fighter jets after the Russian forces launched one of the biggest drone and missile attacks on Ukraine. Poland shut two of its airports as explosions rocked Ukraine in

A series of explosions were heard in the western Ukrainian cities of Lviv and Ternopil, Ukrainian media and a Reuters witness reported on Wednesday, after Ukraine's military warned of a high threat of Russian missile and drone attacks.

Poland's Prime Minister Donald Tusk said Monday that an explosion on a section of railway line used for deliveries to Ukraine was an "unprecedented act of sabotage."

Polish Foreign Minister Radosław Sikorski said Ukraine has a chance to join the European Union in the early 2030s, Polsat News reports. He stated that Ukraine had already cleared an important hurdle despite Hungary blocking the process,

Companies interested in Ukraine's reconstruction efforts are showcasing their products and technologies at an international exhibition in neighboring Poland.