To the second point:
Not only domain, but all the hardware should be situated in Belaus.
сети, системы или ресурсы mean networks, systems, or [hardware] resources.
It reads that networks, systems, or resources must be located in Belarus.
Business entities engaged in activities on the sale of goods, works and services in the Republic of Belarus with the use of information networks, systems and resources with an Internet connection, you should pay attention: if these networks, systems or resources are not available on the territory of Belarus and (or) not registered in the prescribed manner to the subjects can be applied to an administrative penalty of a fine from 10 to 30 base units.
"Located" being the vital difference here.