Actually, ICQ had no relation to Russia in 1990s.

It was acquired by AOL in 1998, went through several rounds of enshittification and protocol changes to defeat third party clients which did not show ads, and finally landed in Mail.Ru group in 2010. In about 2-3 years no one cared about ICQ anymore. Then, it slowly died.

I registered my account in 1998 (got a 7-digit number starting with 9) and the whole thing felt like a miracle back then. My first employer in 2003 used ICQ as a corporate messenger similar to how we now use Slack. Since I mostly used Linux back then, I was very happy to find centericq, then centerim, then finch. One of my first contributions to an open source project was a small patch to centericq, something about contacts panel resize if I remember correctly.

I believe the last time I actually launched any ICQ client was around 2012, and never since then.