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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.

At least 10 people were killed and 37 injured, including 12 children, during a large Russian strike on the city of Ternopil in western Ukraine, said Igor Klymenko, Ukraine's minister of internal affairs. He said the western regions of Lviv, Ivano-Frankivsk, and Ternopil were "under a massive enemy attack" on Wednesday.

A Treasury Department analysis indicates that new U.S. sanctions on Russian oil producers have sent prices there tumbling, choking off a key revenue source that Russia has used to fund its war in Ukraine.

At least 26 people have been killed including three children in a Russian missile and drone attack that hit two blocks of flats in the western city of Ternopil, Ukrainian officials say.

Tensions rose after a blast damaged the Warsaw-Lublin rail line, which has been used to deliver aid to Ukraine, and a Russian missile attack killed at least 25 people in Ternopil.

Ukraine has asked the Vatican to formalize its role facilitating negotiations for the return of Ukrainian children and civilians taken by Russia during the war.

As reports surface of a peace plan drawn up by Russia and the US to end the war in Ukraine, BBC Verify has analysed footage from the frontline showing months of Russian aggression for the Eastern Ukrainian city,