WASHINGTON, Aug. 2 (UPI) -- A U.S. Air Force spy plane ended up in Swedish air space without permission last month after the Russian military began tracking the plane, U.S. military officials said.
The RC-135 Rivet Joint plane was flying in international airspace July 18 to eavesdrop on the Russian military when Russia began tracking the plane using land-based radar, a U.S. official, whose name wasn't reported, told CNN.