Only if you accept Russia's description of where the border is. The border as defined by every other country in the entire world says Ukraine is still in their own territory.
There have been some Ukrainian sympathisers setting off bombs/shooting down aircraft/etc inside Russian territory - but those aren't Ukranian soldiers and they're pretty generally just a few random/nonconsequential attacks and don't show any signs of being linked to any "Operation". The front line of the battlefield is nowhere near the border.