Improved Campaign AI???

So apparently with the new updates, the Campaign AI has changed noticeably, as if it were goal orientated and focused. So I was defending my protectorate in Poland against Russia. Russia took East Prussia and looted, which I have not seen before, when they started chasing the rebels I took the city. Then as you can see below, Russia sent about 2.5 stacks not to mention the 3/4 rearguard at East Prussia, which had a small fort and a full veteran army. Instead of assaulting they are starving me out. I didn't want to be on the offensive for this fight, so sent armies to distract them, but they didn't go for it. In the first picture I took too undefended regions since the siege began and they did not budge.

I think this is quite an improvement.

Meh. I'm playing Prussia right now. Russia declared war on me so I took the fight to them. I have them down to two territories. That's led to every coalition member but Austria declaring war on me and now France is pushing down on my doorstep to boot. I only have one stack in the West so something tells me I'm going to be losing down to and then fighting back from there.