Ukraine is currently striking facilities deep inside Russia.
Russia could hit back in the same way easily, and to some degree they do. But their problem is that the equivalent weapons factories, refineries etc. often aren't in Ukraine, but in NATO countries supplying Ukraine and giving Ukraine explicit permission to use them against targets inside Russia - until they got that in May 2024, Ukraine understandably did not risk alienating their suppliers by doing that.
There aren't very many new lines of escalation crossed here. Russia views it as NATOs proxy war against them now - many hawks in the west haven't been shy about describing it as such either.
And it is in a way. Ukraine is practically fighting on behalf of East European NATO states against Russian imperialism. NATO’s eastern flank is not immediately threatened only because Russia’s curbstomp invasion turned into a war of attrition.
GTFO, Russian propagandist. If Russia dislikes the state of affairs there's a reallyyy easy solution: don't invade other countries baselessly. "NATO's proxy war" is a really funny way to describe the Russian war of aggression.
Countries have always had arms supplied from countries not involved in the conflict.
It's a significant step to escalate to attacking those countries.
> Russia views it as NATOs proxy war against them now
It is an interesting argument to choose to invade a country, act with faux outrage when they find allies willing to supply them with arms and then call it a proxy war.
Russia got themselves into this mess. They have an easy way to get out of it.