Ukraine's allies are set to meet in London this week for a summit on the country's postwar recovery, a vast effort that the World Bank estimated could cost $411 billion.
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Russian forces have improved their defenses, artillery coordination and air support, setting up a campaign that could look very different from the war's early days, according to interviews and documents and videos reviewed by The New York Times.
Ukraine has paid hundreds of millions of dollars for weapons that have not been delivered, and some of the much-publicized arms donated by its allies have been so decrepit that they were deemed fit only to be used for spare parts.