There is some chance that US and other countries making a lot of noise about false flags set back the timetable, just enough to allow the thaw to come into play in an early thaw year. They could have had logistical difficulties just getting into formation, etc. There does not need to be just one reason, but yes covid could be one such reason.
I agree, not so much about stealing the thunder, but trying to limit the bad optics to reduce sanctions. They clearly underestimated the way other countries would react if that is the case. They could also have made some sort of agreement with China specifically to secure limited response in exchange for waiting.
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