"Mother of dragons, Kim Jong-un, Donald Trump".
At least 3.5 million young people and retired soldiers have joined the North Korean military to fight in the event of a war against the USA, state media said, adding that people are rising up "to retaliate against" Washington.
The restrictions came after North Korea's latest missile tests, which it claimed involved the launch of intercontinental ballistic missiles.
Following that vote, reports indicated that the country has developed a miniaturized nuclear warhead capable of fitting on a missile.
The Trump administration has been quietly engaging in the back-channel communication for several months, discussing Americans imprisoned in North Korea - including University of Virginia student Otto Warmbier - as well as the battered current state of relations, the Associated Press reported yesterday. But Mattis said Thursday that the American effort was "diplomatically led".
"The congressmen said such statements had dramatically increased tensions with North Korea and raised the specter of nuclear war".
"It's somewhat reminiscent to me of the history of World War I and how the world kind of blundered into that", Clapper said in an interview with CNN.
But hope hasn't gotten me far lately, so I figure we should prepare for the worst. "I think there is still time for other measures, sanctions, diplomacy and all those kind of things", the former spy master warned.
The so-called "New York channel" is being used regularly by Joseph Yun, the US envoy for North Korea policy, and Pak Song Il, a senior North Korean diplomat at the country's United Nations mission, according to AP.
Trump has urged China to apply more pressure on North Korea.
"Concerned parties must exercise restraint and avoid remarks and actions that escalate tensions on the Korean peninsula", it cited the Chinese president as saying.
Mr Rudd, who just returned to the USA from a trip to China, said "the Chinese baseline conclusion" is Mr Trump's threat of unilateral military action against North Korea was just "one huge bluff". But China says it alone can not compel Pyongyang to change course.