Ukraine will not surrender territory, President Volodymyr Zelensky declared Monday, rejecting a central Russian demand that President Donald Trump had incorporated into his latest proposal to end the Kremlin’s war. “Under our laws, under international law — and under moral law — we have no right to give anything away,” Zelensky said, after meeting with top European leaders to discuss Trump’s plan Monday. “That is what we are fighting for.” The unequivocal declaration that Ukraine will not surrender land could mark the collapse of Trump’s plan, which critics condemned as fulfilling a wish list of Russian President Vladimir Putin. Zelensky,...