As an Estonian, I especially don't like being called eastern europe(ean). We're not, we're northern, according to UN geoscheme classification, according to EuroVoc, and I mean you can also just read the wikipedia page of a place to know where it is at. Furthermore, socially, culturally, and tech advancements wise, we're as far as you could possibly be from Russia association at this point.
Keep it up, if you wave your EuroVoc "NT1 Baltic States" designation harder maybe Pohjoismaiden neuvosto will give up and let you in. Or maybe not: https://satwcomic.com/party-crasher
So, what magic thing would convince you if not the UN, and if you do not respect the people who live in Estonia? I may be off base here, but you sound like a specific someone our people call vatnik. Maybe you'll only be happy if we all just call ourselves Russia.
Finland can into Nordic because it was part of Sweden for 600 years, all the rest all share a tight language family.
You on the other hand can't point to common language, have a paltry 70 years as part of a nordic country, and are literally across a sea. Nothing for it, you need to engineer a breakup of the continental plate and ship your bit across the sea my dude.
I assume they meant "Ukraine and Russia" as a synonym for "eastern Europe" as a whole, but it is a bit dismissive.