The agreement was between China and the UK. If UK feels violated then it can speak up, in international courts. My agreement with Amazon and its potential violation for example has nothing to do with you. Neither does the handover agreement have anything to do with the US. And sure what the US does is completely up to the US. But don't fault the rest of the world to now stand up against not Russia and China but against America's unpredictable, eyebrow raising, and outright chaotic meddling in the affairs of more than a dozen nations and territories. At some point it becomes comical when a nation, that internally struggles to define itself still after 200 years and come to terms with past injustices, tries to not just lecture others but outright meddle in others' affairs. Fortunately China won't be intimidated and deal with HK as it likes and has the sovereign right to do. Equally, the Nordstream 2 project will be completed shortly and Europe will get a seizable portion of its natural gas from Russia at much cheaper prices than what the US is charging and at lower risk from disruptions. The Russia-European relationship (through good and bad times) goes back much further than the entire existence of the US. So does China's relationship with HK. I am sure everyone outside the US will chuckle at house and senate bullies and go on with life and decide what is best for their own sovereign territory. But for the track record: it is meddling in foreign affairs that the US itself has made clear in the past it does not appreciate when done to itself.
Sure, just don't expect the world to sit idly by. The world is free to embargo China and turn it into Cuba for not respecting agreements. After all, it's every country's decision if they want to deal economically w/despotic rule.
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