1 in russian is один, I think it’s quite different from one/uno/un (especially since the о is pronounced а). 2 and 3 are instead extremely similar (два три). Does it actually still come from the same root?
While not being competent in this subject, I found it very fascinatinf that ugro-finnic languages (which are not indoeuropean AFAIK) like Finnish or Estonian are so wildly different, so that 1 2 and 3 are üks, kaks, kolm (in Estonian), for example.
Every point can be supported with an analogy bad enough