The military chiefs of the United States and South Korea spoke over the phone on Tuesday and recognized that North Korea could 'conduct provocative actions' in response to large-scale joint drills between the two countries. 'The chairmen recognized the possibility that North Korea could conduct provocative actions during the Key Resolve/Foal Eagle exercise, or in connection with North Korean major political events in April,' a statement from Chairman of the US Joint Chiefs of Staff General Joseph Dunford's office said. The statement said the two military leaders 'discussed response options' during a call that lasted about 30 minutes.