China and Russia have joined a unanimous UN vote to impose new sanctions on North Korea after its sixth and largest nuclear test.
The council voted 15-0 to back the US-drafted sanctions resolution banning exports of coal, lead and seafood.
Pyongyang has claimed to have developed a hydrogen bomb and has continuously threatened to strike the US.
North Korea is already under UN sanctions to force the leadership to curtail its weapons programmes.
The new sanctions were agreed on Monday after the US removed some of the tougher proposals it had announced last week, including a complete oil embargo and measures to freeze the assets of North Korean leader Kim Jong-un.
The measures, including a ban on textile exports, target Pyongyang's ability to fund and fuel its nuclear programme.
It is the ninth such resolution unanimously adopted by the UN since 2006.
Testing North Korea with sanctions
30 November 2016: UN slapped sanctions on North Korea over its nuclear programme, targeting its valuable coal trade with China, slashing exports by about 60% under a new sales cap. Exports of copper, nickel, silver, zinc and the sale of statues were also banned
What happened next? On 14 May 2017, North Korea tested what it said was a "newly developed ballistic rocket" capable of carrying a large nuclear warhead
2 June 2017: UN placed new sanctions, imposing a travel ban and asset freeze on four entities and 14 officials, including the head of North Korea's overseas spying operations
What happened next? On 4 July, North Korea said it carried out its first successful test of an intercontinental ballistic missile (ICBM).The Hwasong-14, it said, could hit "any part of the world" (US estimates said that this was unlikely)
6 August: UN unanimously agrees to the banning of North Korean exports of coal, ore and other raw materials along with limiting investments in the country
What happened next? On 3 September, North Korea said it had successfully detonated a hydrogen bomb - many times more powerful than an atomic bomb - that can be miniaturised and loaded on to a long-range missile