North Korea warned Tuesday it has been preparing to send troops to the Demilitarized Zone dividing it from South Korea, in retaliation for Seoul's failure to prevent defectors from dropping anti-Pyongyang leaflets over the border.The General Staff of the Korean People's Army said in a statement it would study "an action plan for the army to advance into zones that had been demilitarized under the North-South agreement.""Our army is on high alert to ensure a military response and implement any measures ordered" by the ruling Workers' Party and the government, said the statement, carried by t…READ FULL ARTICLE