False flags aside, just what is Putin's justification for invading Ukraine?
Russia didn't suddenly decide to invade Ukraine out of nowhere. Here is how I see it.
Back in September-November 2020, Azerbaijan performed an offensive on Nagorno-Karabakh held by the Armenians, and regained most of the territory they lost in the Karabakh War of the early '90s (which is now called the "First Karabakh War").
Inspired by Azerbaijan's success, Ukraine, who was building close relations with Turkey, too (it's not like Turkey and Ukraine are culturally close - it's more like "the enemy of my enemy is my friend"), wanted to do the same with the territories on the east (Donbass) that are controlled by the separatists of Russian ethnicity, known as the self-proclaimed Donetsk and Lugansk People's Republics since 2014. Ukraine even bought some Turkish-made attack drones (Bayraktar TB2) that performed well in the Second Karabakh War, and keeps getting other modern foreign hardware, such as US-made 3rd generation ATGMs (FGM-148 Javelin). No wonder they're itchy to give these new toys a try.
Just about three months ago, Ukraine used the Bayraktar drones in combat, attacking the pro-Russian militia and destroying their howitzer. Occasional clashes continue since then, and tensions keep escalating. Russia can't stand still if Ukraine launches a full-scale offensive on Donbass - back in 2014-15, during the hottest phase of the conflict, Ukrainian army didn't care much about collateral damage when they used heavy artillery in living areas, causing massive civilian casualties. If Ukraine attacks once more, the people of Donbass (most of whom are ethnic Russians) will be in danger again, and that will be a huge disgrace to Putin (who was supposed to defend them) if he allows them to be slaughtered.
What added more fuel to the fire recently is NATO's decision to accept Ukraine into the alliance, which will allow them to place their military bases and deploy missiles at Russia's doorstep. The recent negotiations between NATO and RF went to a dead end probably because Russia doesn't have any trump cards in hand to play (any arguments or tools to persuade on the negotiations) - except military force. Ironically, Russia's announced plans to deploy its bases in Venezuela or Cuba in response are unsurprisingly strongly opposed by the US - it would probably be a Cuban Missile Crisis 2.0. Yes, double standards as they are.
So, what's going to happen?
The Russian bloggers who highlight the situation around Ukraine (one of those bloggers I read used to fight for the separatists of Donbass in 2014), the people on social media who live there, the Telegram channels of soldiers on both sides - most of them report a strong feeling that "it's going to blow soon". They believe the situation is like a powder keg that can explode any minute, within a month or two, at best. But in my humble opinion (I'm no expert, and I'm not pretending to do any predictions though) - it's just Russia's attempts to put pressure on Ukraine and NATO and force them to negotiate. If Russia seriously decided to invade Ukraine, it would do it already, instead of walking around and giving Ukraine more time to prepare.
Anyway, those Russian troops gathered around the Ukraine's border are supposed to take part in a large military exercise in Belarus that is scheduled for 10 to 20 February, and people who highlight the situation expect these days to be the deadline. When the excercise ends, the troops will step back and return to their bases...
...or not.