Ukraine has intensified its diplomatic push for aid ahead of an expected spring counteroffensive, asking allies for support to repel Russian forces and rebuild the country's battered infrastructure.
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A leaked U.S. intelligence document lists Serbia as a country that has sent or is ready to send lethal aid to Ukraine, a revelation likely to create tensions between Russia and the Balkan nation, a close partner for centuries.
The U.S. and Britain targeted the networks of some of Russia's wealthiest oligarchs with new sanctions on Wednesday, part of a round of measures aimed at further limiting Russian access to the international financial system.