Mindlessly belligerent, yes.
"Any reason" is a bit of a stretch — I doubt Putin has a dice with country names on it — but given how dumb it was to invade Ukraine, it's not unreasonable to assume he's dumb enough to try Japan.
"Any reason" is a bit of a stretch — I doubt Putin has a dice with country names on it — but given how dumb it was to invade Ukraine, it's not unreasonable to assume he's dumb enough to try Japan.
One thing Japan has that Ukraine does not is a whole bunch of US military installations. (And a mutual defense treaty, but you know what they say about three useless forms of North American paper)
I don't, but I can guess where you're going from the context.