Warmbier was among the estimated 5,000 non-Chinese who visit North Korea every year on packages that often include trips to Pyongyang, the capital, as well as the demilitarized zone separating the two Koreas, Mount Paektu and sometimes the Masik ski resort.
"We can not know for sure that North Korea killed Mr Warmbier, but I believe it is quite clear that they have a heavy responsibility in the process that led to his death", Moon told CBS television's "This Morning". North Korean officials accused him of hostile acts, and after a tearful and apologetic trial, he was sentenced to 15 years of hard labor.
Seoul's Defence Ministry said the bombers engaged in routine exercises with South Korean fighter jets aimed at showing deterrence against North Korea. "And then, as a second phase, try to achieve the complete dismantlement of North Korea's nuclear program", he added.
The bill has been referred to the House Foreign Affairs Committee.
When a senior USA official visits North Korea, it is usually taken as a sign that tensions between the adversaries are easing somewhat.
A public funeral has been planned for American student Otto Warmbier, who died shortly after being released from North Korea.
Warmbier's death came just days after he was released by the North Korean government and returned to the United States suffering from extensive brain damage, according to the USA doctors who treated him.
Warmbier's sophomore English teacher said he would be "dearly missed".
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No cause of death has been determined for student Otto Warmbier (WARM'-beer).
Mr Warmbier, 22, died on Monday after being medically evacuated to the United States last week after suffering from severe brain damage, with US President Donald Trump blaming Pyongyang's "brutal regime" for his plight. "I believe we must now have the perception that North Korea is an irrational regime".
Geng said China has played a "positive constructive" role regarding North Korea because it is a responsible member of the global community, and "not because of any pressure from other countries".
In the wake of the news of Otto Warmbier's death, Young Pioneer Tours, the travel company that brought Warmbier to North Korea, announced it would no longer be bringing Americans to North Korea.
The travel agency specializes in North Korea tours and is based in the central Chinese city of Xi'an. But he wasn't the only American detained by North Korea.
Warmbier was detained in January 2016 while visiting North Korea at the end of a five-day tour.
"They just murdered him", McCain said. Three Americans are still now being held in North Korea.
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