Most people don't even realize that just about the same conditions led Japan to attack during WWII. There comes a time when you keep pushing a guy, and he says, enough! No mas!
Japan invaded China in 1931, Thailand in 1941 and had attacked Hong Kong, Singapore and Malaysia. It was kind of on a roll attacking stuff before it hit the US in a way that is rather different from modern Russia.
Indeed. For example, when you push into the Ukraine and annex Crimea via military occupation.