China's restraint in this situation so far is remarkable. Meng was arrested in Vancouver on December 1, the day President Xi and Donald Trump met after the G20 summit in Buenos Aires and agreed to suspend their tariff war for 90 days. Stock markets rose on the news but soon subsided when it was realised they had only Trump's word about what was agreed and the Chinese were saying little. The markets have been distinctly more nervous since December 7 when the Huawei executive's detention became known.
China has so far directed its response only to Canada, calling on it to release her. The Chinese Government may not want to be too protective of Huawei which has been shut out of American, Australian, Canadian and now New Zealand consideration for the provision of digital equipment for fear the company may be a security risk.
Some would claim the risk was proven if China was to press more strongly for Meng's release, but any Government would do the same if one of its nationals was detained on such a contentious issue.
The charge dates from 2015, the same year sanctions on Iran were suspended by the deal reached with the US, Britain, France, Germany, Russia and China under which Iran would suspend nuclear weapons development. The sanctions have been revived by the US alone but it is demanding that firms in all countries cease trading with Iran or be shut out of the US market.
To be shut out of that large market is the only punitive measure the US needs. To seize and detain company executives for this is going too far.