In the context of the recognition of the Donetsk People's Republic and the Luhansk People's Republic by Russia, I cannot seem to find whether the territories of said republics correspond only to what they currently control (22/02/2022) or include the original territories of Donetsk and Luhansk.
In the Wikipedia article for Donetsk it says it includes all the original territory (Donetsk Oblast, I think). However, it does not say if Russia recognizes all of it. Same for Luhansk.
It would follow that if Russia recognizes the whole Oblasts, Ukraine is currently occupying those territories. Which would be a clear casus belli for Russia.
Obviously, I understand that the situation is more complex than this, but this point could be important to understand the next actions by Russia (mainly).