potentially serious disruption and chaos
While the effects of a comprehensive boycott of "Western", meaning US technologies by China and Russia are unclear, many in the West would be naive and ignorant to assume that a great deal of the best technologies are actually under the ownership or control of Western powers.
For example, in software the Free/Open Source Software (FOSS) products of PostgreSQL, NoSQL, MySQL, Ingres Databases, Apache and nginx HTTP/proxy servers, Firefox and Chromium web browsers, FOSS Groupware, collaboration, Office Suites, Graphics, Animation and professional CADD, Networking stacks, and many more world class software technologies are accessible to the two and any other entities.
Even the fairly excellent Sparc and MIPS CPU Chip designs, which are licensed to Fujitsu and other Asian nations are obtainable by China and Russia, and they can just as well develop to the Open Hardware specifications put forth by Facebook, Twitter and other top US technology firms.
And arrogance should not detract from fact that Huawei and ZTE of China possess very elaborate and sophisticated Networking technologies, already implemented worldwide
Boycots of US technologies will certainly not put these 2 countries in any position of equivalence in technological prowess with the West, but is guaranteed to cause significant chaos, especially if they develop their own Internetworking protocols contrary to current standards, and adopted by dozens of other Asian, African and South American countries.