Kremlin: the Donetsk and Lugansk republics are merely "so-called" so and nearly always "self-declared;" but ISIS is called IS

What is also notable and striking is that when Lavrov, the Russian government, or the Russian state media refer to the Donetsk and Lugansk People's Republics, they hardly ever forget to add "self-declared," "so-called," and/or "unrecognized." Now, as we have seen, when referring to ISIS, Lavrov's term of choice for this terrorist army is IS, "the Islamic State," to which ISIS changed its name relatively recently, thus insisting that it a state in its own right. In Russian, it is "IG" (Islamskoye gosudarstvo). And when speaking of IS (IG), Lavrov does not bother to add any of the bracketing or rhetoric clauses, which are used for the Donetsk and Lugansk People's Republics--for his own people, one might say. In the case of ISIS, it is the Islamic State. Is it because no bothered to have some sort of Minsk, which would restore sovereignty of Syria, Iraq, Libya by dismantling the principal terrorist army created thanks to the combined efforts of Syria's neighbors and the West?