According to Google translate your quotation says:
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.
Google translate is wrong in one part. Rather than "... are not available on the territory of Belarus", "... если эти сети, системы или ресурсы не размещены на территории Беларуси" translates to "If these networks, systems or resources are not located on the territory of 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.