South Korea has carried out military exercises overnight - as it's reported the North is preparing more missile launches.

An unverified report from Seoul claims the secretive state has been seen moving what appears to be an intercontinental ballistic missile towards its west coast.

The US insists "enough is enough", but Sky's Katie Stallard - who's in Beijing - says the warning isn't a deterrent for Pyongyang:

It comes as Russia says new sanctions against North Korea would be "useless" and "ineffective".

The Russian President Vladimir Putin said that imposing tougher sanctions on the regime of Kim Jong Un over its nuclear missile programme would not change the leadership in Pyongyang, but could lead to large-scale human suffering.

Speaking after a summit in China, Mr Putin, while condemning North Korea's actions as "provocative", also warned against further ramping up military hysteria, saying it could lead to "global catastrophe".

On Sunday, Donald Trump tweeted that the US was considering stopping all trade with countries that do business with North Korea, prompting a stern response from China.

The United States is considering, in addition to other options, stopping all trade with any country doing business with North Korea.

— Donald J. Trump (@realDonaldTrump) September 3, 2017