Bad headline. What is dissolved is the non profit organization that exists in Russia to host events for Russian Wikipedians and other tasks. ru.wikipedia.org != Wikipedia Russia.
Reminds me so hard if the Monty Python sketch:
Wikimedia RU does not fall under these categories. In fact, it was a non-profit organization completely independent of Wikimedia, run by individual enthusiasts, sometimes not even interested in editing Wikipedia. However, Wikimedia did recognize the merits of this Russian company to some extent (in particular, it did not hinder fundraising for offline events and did not require reports).