I am sure someone might point out that up until last week in the run up to the Invasion when Russia formally recognised the regions in question the separatist forces were unquestionably within the borders of the "powerful state" whose forces were engaged there (if there was an armed insurgency in Cornwall would the rest of the UK - or at least England - stand by and do nothing?). The Minsk agreements were supposed to end the conflict & protect life in the region (of both those - the majority - who identified as Russian & those who identified as Ukrainian or who didn't care one way or the other). They failed. As for the media, it just gets bored of reporting when something becomes the status quo (or I am sure would argue reflects a boredom in its viewers/readership) & it quickly moves on (the odd piece revisiting it aside - and there have been such pieces).
But of course, protecting those in that particular region was, as you said earlier, merely a pretext anyway for the current conflict. And don't get me wrong, I understand a desire by Russia to not have NATO in Ukraine whilst vestiges of the Cold war remain as it & "the west" continue to define themselves/ourselves against each other. And it is that latter point that is at the heart of why what is happening now goes beyond an immediate desire for bolstering the security & influence in Ukraine of Russia otherwise weakened in its view by the events of 2014. It has become a deliberate attempt to turn back the clock to a time where Russia was & felt itself the foremost non-US player on the world stage and plays on Western narratives that have continued to emphasise an "other" nature of Russia that most Russians themselves probably do not recognise. Furthermore, it will be something that will be popular with some in Russia (a quick shout out again to my father-in-law at this point) who have felt the waning influence of the country, of a reduced significance in the world.