The trigger for Huawei’s decision to stop taking orders and move to close its Russian office is fear of secondary sanctions by the US (Forbes with that take).
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Huawei halved supply of phones to Russia in March
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Huawei has sent part of the employees of the Russian office on vacation for a month
https://www.forexlive.com/news/huawei-is-suspending-all-orders-in-russia-20220410/
The series with the mass exodus of IT companies from Russia continues. Large corporations are closing their offices and among those who suspend their work in the Russian market is Huawei. Initially, in March, it halved the supply of its smartphones to Russia, believing that doing business here in the current situation is extremely risky.
Now it intends to close its Russian office altogether. One person with knowledge of the matter says that the company has stopped taking orders and is preparing to close its corporate office in Russia, which deals with telecommunications and networking equipment. The Chinese employees of the Russian office and part of the Russian specialists will leave the territory of Russia, and the rest will be on vacation.
https://www.gizchina.com/2022/04/09/huawei-joined-the-boycott-of-russia/