No. It's what they always do, they push boundaries to see what resistance they face. Russia are an extremely paranoid state, western Russia is very vulnerable to military invasion and ever since the second world war they've used "micro aggressions" like this to show that they will cause mass destruction if threatened.
Now, none of this condones anything they're doing and the paranoia is clearly unfounded because they already get away with doing nearly anything they want within their own state. You only have to look at their desperate environmental and human rights record with relatively little external pressure.
I don't really fear any massive escalation, I don't think Russia really cares about expanding its borders, it's just their way of aggressively telling everyone to leave them alone. Partly so they can continue with their poor humanitarian practices for sure but mostly because, rightly or wrongly, they don't trust western nations.
This aggression is negatively effecting innocent people and threatening more destructive political and physical effects more than their usual bullshit which is why it's garnering more attention, and pressure on third party countries to act. It'll end in some "semi-compromise" where Russia look like or convince themselves they've gained something when in actual fact they haven't as per usual in my opinion.
Surely though this whole situation would achieve the exact opposite, namely of pushing Ukraine towards NATO precisely to stop this nonsense. I mean Russia keeps wondering why NATO has been expanding eastwards and it's **** like this that is why, smaller countries simply can't trust Russia to not try throwing it's weight around in eastern Europe.
I don't see how Russia can come out of this in a better situation than they went into it. Nord stream 2 is being questioned, Europe will see Russia as even less reliable and will look for alternatives to Russian oil and gas, Ukraine will become even more firmly entrenched in an anti-Russian position, the militaries of eastern Europe will likely be bolstered and Russia gains what? Also if Russia wasn't interested in expanding their borders, what have they been doing in Georgia and Crimea? Look at the similarities to Georgia:
- Pro-Russian Georgian separatists instigate a conflict with the Georgian government
- Georgia eventually declares a unilateral cease-fire that the separatists proceed to ignore and attack Georgian towns
- Georgian army pushes them back
- Russian army charges in claiming to be supporting the rights of the separatists and launches bombing campaigns and blockades well beyond the disputed areas.
- A cease fire is negotiated, Russia recognises the separatist territories and withdraws. Russia in reality maintains control over these areas.
Russia suffered next to no retaliation internationally. See the similarities? They have pulled this stunt before and got away with it so here they are, pulling the same stunt again on an even bigger scale. Just like when they carried out assassinations in the west with little punishment so happily did so again. They have pushed the boundaries as you said and, from past experience in Georgia and Crimea, they have learned the boundary is they can walk into somewhere and annex it with minimal consequences. All they need is implausible deniability and that is enough. Just flat out deny reality even as it is clear as day to everyone that they are lying.