Russians are "testing their luck" by flying a replacement A-50 spy plane over the Sea of Azov, days after Ukraine claimed to have shot one down, Ukraine's Air Force spokesperson said on Friday. Spokesperson Yurii Ihnat said on national television that a Russian Beriev A-50—nicknamed the "Bumblebee" and given the NATO reporting name "Mainstay"—was detected over the Sea of Azov on Friday morning, according to Ukrainian outlet Ukrainska Pravda. A Beriev A-50 early warning and control aircraft flies over the Kremlin and Red Square in downtown Moscow to mark the 75th anniversary of the victory over Nazi Germany in World...