Moscow, July 21 -- The Polish and allied air forces have been activated amid alleged Russian activity in Ukraine, the Polish Armed Forces Operational Command said. "The Polish and allied air forces have begun operations, and ground-based air defense and radar reconnaissance systems have been put on high alert," the operational command said in a statement. The Polish military claims that the measures taken are aimed at ensuring security in the territories bordering "vulnerable areas." "The operational command of the armed forces is monitoring the current situation, and subordinate forces and assets remain fully prepared for immediate response," the statement says. The Russian Defense Ministry has repeatedly stated that Russian aircraft fly i...