President Biden has approved the deployment of another Patriot missile system to Ukraine, senior administration and military officials said, as the country struggles to fend off Russian attacks on its cities, infrastructure and electrical grid. Mr. Biden’s decision came last week, the officials said, after a series of high-level meetings and an internal debate over how to meet Ukraine’s pressing needs for bolstered air defenses without jeopardizing U.S. combat readiness. The new Patriot...