Analysts do not doubt president's message that US could destroy Pyongyang, but they say no clear strategy emerged from his UN speech.
Draft of proposed new sanctions on Pyongyang headed a vote by UN Security Council next week, yet Beijing fears such a move would destabilize Pyongyang.
Some nuclear weapons experts question Pyongyang's claim that ICBMs carrying compact nuclear warheads can now hit the US mainland.
Kremlin contends Pyongyang launched a smaller missile last week, not an intercontinental-range device.
But White House says 'time is running out for Kim Jong Un and his regime to either behave or to suffer the consequences'.
John McLaughlin says apparent motive for assassination of North Korean leader’s half brother was attempt to remove any alternative to current leader.