system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How is Russia able to get away with all of this in front of the eyes of the world with relative impunity?
gpt
Because going to war with Russia would, essentially, mean WW3.  The possibility of enormous casualties in this type of situation is obviously quite high.  Also, Russia has nukes.

Another factor-- Ukraine really isn't that big of a deal to the powers that be.  If the UK or another "first world" power was being invaded, it would be a different story.