Ukraine awoke on Monday to another day of war – Russian drones blasted buildings in the Kharkiv and Odesa regions – but also to news that it had won its first Oscar. The best documentary victory for Mstyslav Chernov’s “20 Days in Mariupol,” a harrowing first-person account by The Associated Press journalist of the early days of Russia’s invasion in 2022, was bittersweet. “This is the first Oscar in Ukrainian history, and I’m honoured,” an emotional Chernov said on Sunday at the Academy Awards. “Probably I will be the first director on this stage to say I wish I’d never made this film, I wish t…