Note that nowhere in that article does it say that the Ukrainian side did that. For all we know this was a provocation, as Russia is won't to do. Alternative explanations have been present many times and none of them have stuck.
Also note that there was an endless build-up prior to the second phase of this invasion which had absolutely nothing to do with that particular incident even if it was done by the Ukrainian side, which I highly doubt given the fact that it was one of the pretexts used.
Finally: in that region there have been many actions by either side and no matter what: the Ukrainians are well within their right to kick out an invader, the myth of the separatists has been debunked solidly, until the little green men showed up there was no meaningful separatist activity.
If you are asserting that the Helsinki-based OSCE was duped by Russia detonating a bunch of explosions on their own side of the line of control....prove it. Extraordinary claims require extraordinary evidence.
"By February 24th, there was nothing out of the ordinary. Now the [Russian] Defense Ministry attempts to fool society, tries to fool the President, and tell the story of a crazy aggression from the Ukrainian side and they were going to attack us with the whole NATO block."
Not sure how you get more conclusive then that; Putin himself?
https://en.wikipedia.org/wiki/Organization_for_Security_and_...
It does not support your (Russia’s, really) claim of a Ukraine-initiated escalation
On page 2, with the map of the Donbas, the vast majority of the explosions are in northwest Luhansk, NE of Luhansk city itself, and North of Donetsk....on the Separatist side of the line of contact.
That the surge in shelling was Ukraine-initiated against Russian-backed separatists (and not vice versa coordinated from Moscow as part of the prelude to its own invasion)—and, even moreso, that even if it was, a Ukrainian offensive against separatists in Ukraine (and not even against the openly Russian-occupied part) was a reasonable basis for seeing a threat of NATO invading (or backing an invasion of) Russia—is the Russian propaganda.
OSCE via Reuters: https://www.reuters.com/world/europe/osce-reports-surge-numb...
Unless Reuters is "naked Russian propaganda" now, there was definitely an uptick in kinetic activity in the Donbas, with most of it falling on the Separatist side of the line of control.