Fred and Cindy Warmbier had earlier this year criticized the US president over his 'lavish praise' of North Korean dictator Kim Jong Un

Missiles fly about 330 kilometers before splashing down in sea off country's east coast; South says it is monitoring for any further launches

Move by Pyongyang latest to put question mark over resumption of denuclearization talks with US

Streak of weapons display by Pyongyang apparently aimed at pressuring Washington and Seoul over joint military drills, slow nuclear talks

After fifth launch in two weeks, US president says Pyongyang offered a 'small apology' for missile tests, wants to resume talks once US-South Korea war games end

Latest test comes while UN Security Council meets over Wednesday's missile launches, after Pyongyang angered by US-South Korea military drill

Pyongyang says Kim oversaw firing of 'multiple launch guided rocket system' after South Korea raises alarm over what it describes as short-range ballistic missiles; UN to discuss

Observers say launches are aimed at ramping up pressure on the United States to make diplomatic concessions

Move complicates efforts to resume stalled nuclear talks with Washington and signals anger in Pyongyang over planned US-South Korea joint military exercises

North Korea has not yet responded to South Korea's calls for repatriation of its citizens