The standard Kremlin line is that it is a "civil war" being fought by coal miners and tractor drivers against a "fascist junta" in Kiev.
There are (independently verified) at least ten thousand Russian Armed Forces regulars as well as special forces on Ukrainian soil, supported, in some critical clashes, by artillery fired from the Russian side of the border, Russian regulars involved in and getting Russian Armed Forces decorations for "combat in support of the Fatherland" inside Ukraine, involvemement of new Russian weapons systems which had never been exported to Ukraine, deployment and use of Russian antiaircraft systems with Russian crews (this is currently the subject of criminal proceedings in the International Court of Justice) and was, of course, how Malaysian flight MH-17 was shot down, with the loss of 298 civilians on board.
The Kremlin is involved up to its eyeballs and continues to spin a bullsh*t story denying any involvement in fomenting the conflict and supplying arms as well as Russian regulars and mercenaries to fight on Ukrainian soil.
They are doing the same in Georgia, Chechnya, Moldova and Ukraine. And everywhere it's deny, deny, deny and issue your military medals for taking part.
It suits the Kremlin to spin it as a "civil war".