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'.