Dustin Johnson and Zach Johnson withdraw from golf tournament in South Korea . The pair were scheduled to play a round of the WGC-Cadillac Championship on Sunday but withdrew after being told they would not be allowed into North Korea. Tournament sponsor insists that the event can safely go ahead this week . Ballantine 's Championship is co-sanctioned by European and Asian tours .
Dustin Johnson and Zach Johnson withdraw from golf tournament in South Korea . American golfers worried about recent tensions on the Korean Peninsula . Tournament sponsor insists that the event can safely go ahead this week . Ballantine 's Championship is co-sanctioned by European and Asian tours .