No, it has virtually no plot and what plot it does have is the reverse...
Retired CIA assassin feels repressed living a normal 9 to 5 life and suddenly snaps, badly slapping a gang of youths as he does. Unfortunately one of those yoofs is related to a Russian monster who gets jolly upset, and thus an escalating tit-for-tat of part thriller/part comedy violence ensues.
I seem to remember a comedy violence scene where he beats four young lads in the enclosed space of a bus?