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There are US sanctions on China.

There is however a huge problem with sanctions: you need to have a realistic plan for what you want to accomplish with your sanctions, or else it does little more than adding some friction to trade.

That means that if you want to actually change the behaviour of a nation using sanctions, you need to have modest goals, an acceptance of compromise, and a readiness to let the other side come out looking like a respectable partner. These are basically things the US cannot muster in the relationship with Iran and North Korea, and the American violation of the JCPOA has significantly eroded US ability to persuade other countries to impose their own sanction.

For China and Russia, the US alone cannot impose any important amount of sanctions and have them be upheld by third parties, the USA trying to block all imports from China would just mean the rest of the world needs to switch to using Yuan or Euros because that volume of trade simply cannot be replaced.