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.
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.