There are currently more than 20,000 North Korean defectors in South Korea , according to the South 's Unification Ministry . A boat with a crew of 31 crosses into South Korean waters , the Red Cross says . Hide Caption 8 of 55 Photos: South Korea holds military drills as tensions rise – People watch from across the Yalu River in Seoul on April 10. The number of defections has risen dramatically in the past decade .
A boat with a crew of 31 crosses into South Korean waters , the Red Cross says . Hide Caption 8 of 55 Photos: South Korea holds military drills as tensions rise – People watch from across the Yalu River in Seoul on April 10. The number of defections has risen dramatically in the past decade .