The story goes like this:
The Russian word for Champagne is "Shampanskoe".
According to this new law, only (certain) Russian sparkling wines can use that label, actual Champagne from Champagne cannot.
They can still put the word "Champagne" in latin letters on their bottles, but in Russian it needs to be sparkling wine.

Predictably, Champagne producers and France as a country are pretty pissed off.

It could be said that Russia is trolling and ragebaiting France with this move - a behavior it has clearly cultivated towards the rest of the world ever since Putin.

Just like Mr Erdogan might be percveived as trolling the rest of the world by demanding Turkey be internationally called "Türkiye" from now on.

Imagine Germans demanding their country be called Deutschland from now on. Finns demanding it to be called Suomi from now on. Etc. etc.