Quiz time: what is the Siberian creature in this video?

http://siberiantimes.com/other/others/news/get-out-of-my-puddle-angry-otter-attacks-tractor-in-funny-video

This video show a creature that is clearly NOT an angry otter. My guess is that it is a non-native muskrat, but I am not certain. Let the subject matter expert commence their weighing in.