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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.

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.

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.

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.

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,

The Abu Dhabi National Oil Company, based in the United Arab Emirates, is in talks to buy Russia’s stake in energy behemoth NIS, according to an official U.S. document seen by The Wall Street Journal.