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.
To be more specific, "Wikimedia RU" was dissolved. I remember when they opened a legal entity, the lawyer said that one should not use the word "Russia" in the name of the company, as this requires permission from the Ministry of Justice of the Russian Federation. Such permission can be obtained by a company that has branches and/or representative offices in more than half of the subjects of the Russian Federation, or belongs to the largest taxpayer, or more than 25% of shares (stakes) of which are owned by the state.
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).
