By Andrea Shalal, Aislinn Laing and Robin Emmott MADRID (Reuters) -President Joe Biden said on Thursday the United States will provide another $800 million in weapons and military aid to Ukraine, hailing the courage of Ukrainians since Russia invaded in February. Speaking after a NATO summit that saw the alliance also agree to take in Finland and Sweden, Biden said the United States and its NATO allies were united in standing up to Russian President Vladimir Putin. “I don’t know how it’s going to end, but it will not end with Russia defeating Ukraine,” Biden told a news conference. “Ukraine ha…