https://www.digitimes.com/news/a20220530PD204.html
Taiwan's Ministry of Economic Affairs (MOEA) has announced a list of strategic high-tech commodities that are banned from exportation to Russia and Belarus.
Belarus is on the list as it may help Russia import such goods, MOEA said, adding the list is pursuant to Category 3 to Category 9 of Wassenaar Arrangement.
Microprocessors or microcircuits with any of the following conditions are under the ban: (1) Performance speeds reach 5 gigaFlops or higher and an arithmetic logic unit has access width of 32 bits or more; (2) clock frequency rates exceed 25MHz; (3) more than one data or instruction bus or one serial communication port that provide direct external interconnection between parallel microcircuits at a transfer rate of 2.5MB/s.
ICs with more than 144 pins or basic gate propagation delay time of less than 0.4 nanosecond are also prohibited. Intel 486. Are these even made still?
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So - no 64bit chips. And not higher than 25Mhz. (Note: that's Mhz. M not G). That means back to about 1990. Intel 486. Are they even produced anymore?