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China have made the mistake of arresting Canadian citizens in retaliation for Meng's arrest in Canada, but Canada were acting on the arrest warrant from the US. So if they want the US to drop the charges they need to look at getting a high profile US citizen on some made up charges who is visiting China. Trump has pretty much said he will intervene in the interests of national security (read between the lines that means money) but at the moment there is no incentive for him to do so.