2. Yandex was never owned by the Russian government, albeit government-related censorship happened (but so does on Twitter/Google/Meta etc as they all have to comply with local laws where they operate).
3. Kagi answers questions about Russian war crimes. You can try yourself [1]
4. There's no such thing as a legal war, the closest is a UN sanctioned peacekeeping operation.
[1] https://kagi.com/search?q=what+war+crimes+did+russia+commit+...