President Volodymyr Zelensky vowed Friday to do everything to defeat Russia this year, as the first highly-sought Leopard battle tanks arrived in Ukraine on the anniversary of Europe’s largest conflict since World War II. The German-made Leopard tanks from Warsaw rolled in to help Ukraine repel Russian troops as Polish Prime Minister Mateusz Morawiecki visited Kyiv to send a “clear and measurable signal of further support". Poland will send more tanks soon, Morawiecki said, also offering to train Ukrainian pilots to fly F16 jets, as Western allies underlined their unwavering support. The United States ramped up sanctions on Moscow, this...