This comes after North Korea's latest nuclear test. And the U.S. ambassador, Nikki Haley, says the resolution is meant to starve the regime of the money it needs to develop its nuclear and missile programs.
"It's just another very small step".
According to the US government, that country's trade in goods and services with China last year totalled $648.2bn.
Meanwhile, Democrats charged that Trump is exacerbating the increasingly tense standoff with North Korea with his belligerent comments and tweets.
And Secretary of State Rex Tillerson is certainly keeping the door open to diplomacy.
North Korea claimed the test was a hydrogen bomb, but many experts doubted the veracity of that claim, saying it could be a boosted version of a nuclear bomb.
"The forthcoming measures by DPRK will make the US suffer the greatest pain it ever experienced in its history", he said.
These new measures will ban the country from exporting textiles - which was the final thing they were still allowed to export after eight other previous sanctions - and impose a cap on all imports of crude oil into the nation.
Thornton noted that last month the U.S. rolled out new sanctions targeting Russian and Chinese individuals and entities. "If they cannot, we will not let them use it", the staffer said. On Twitter, he's been pretty adamant about that.
A US official, familiar with the council negotiations and speaking on condition of anonymity, said North Korea imports 4.5 million barrels of refined petroleum products annually and 4 million barrels of crude oil. That's all in violation of past U.N. resolutions. It retains language reaffirming support for long-stalled six-party talks with that goal involving North Korea, the U.S., Russia, China, Japan and South Korea.
The sanctions include reducing North Korea's oil imports, and banning the country from importing natural gas and exporting textiles.
The foreign ministry painted the new sanctions push as an attempt by Washington to "obliterate" its sovereignty.
The United States had originally pushed for a strict oil embargo, as well as a freeze on the assets of North Korean leader Kim Jong-Un.
It also bans all textile exports and prohibits all countries from authorising new work permits for North Korean workers.
US officials have also hinted that they are ready to do more.
So while China does not want a nuclear North Korea, it wants a North Korean collapse even less and it will resist any sanctions which risk that outcome. If it proves it can live in peace, the world will live in peace with it. "The choice is theirs". The British ambassador pointed out that this is going to take time for sanctions to have a real impact.
Despite the rhetoric, there was a sign both sides are looking for a diplomatic solution.
She said the sanctions could eventually starve North Korea of an additional $500 million or more in annual revenue.
"I believe the response from the United States and our allies should be supercharged", said Representative Ed Royce, chairman of the House of Representatives Foreign Affairs Committee.
'My hope is the regime will hear the message loud and clear and it will choose a different path, ' he added. "We have not seen any such indication".
Unilateral pre-emptive military action by the US would risk conflict with China again.
North Korea exported a total of US$305,713 of iron and steel to China, Egypt, France, India, Ireland and Mexico between October and May, violating a sanction imposed in 2016.