Authorities in Russian-annexed Crimea canceled commemorative military events next month in part because of the Kremlin's sensitivity over high Russian troop losses in Ukraine, according to British defense officials. On May 9, events are held around cities in Russia to mark the Soviet Union's role in the victory over Nazi Germany during World War II in what is known in the country as the Great Patriotic War. The biggest event takes place in Moscow with a march-past of troops in Red Square and a display of Russian military hardware. However, authorities in Russian regions close to the border with Ukraine,...