Business visa and humanitarian visa (Moscow)

Hi! I'm planning to travel to Russia this fall and want to stay longer than one month. I will probably be able to get a business visa for 90 days (or maybe a humanitarian visa). Does anyone know if I can re-enter Russia on a new visa after the 90 days have passed (eg leave Russia after 90 days but then come back on a tourist visa for another month), or do I have to wait abroad for a certain period of time before I can re-enter Russia? (Note that I am not planning to go on the business multientry visa, where you (if I understand correctly) only can be in Russia for 90 days during a Protected content period.) Appreciated any help with this!