Add address list

/tool fetch url=https://itservice-bg.net/download/block_ru.txt mode=https
/import file-name=block_ru.txt
/ip firewall raw add action=drop chain=prerouting dst-address-list=block_ru

Remove address list

/ip firewall address-list remove [find where dynamic]
/ip firewall address-list remove [find where list=block_ru]