If they had it weaponised, and obviously chose a well documented agent that they hadn't declared, rather than any of the other options available, it's a pretty big swivel finger he's giving the International community.
It is, and the only way he would be able to deal with it would be either by having very heavy sanctions - of the sort that prevented trade both ways of chemicals and associated industrial equipment (ie: anything that could be used to make CW), prevented the regime having the money to continue any programmes and utter isolation diplomatically; or he could carry out some humiliating climb down that resulted in exposure of the programme, a rigorous inspection regime and dire threats if he ever did it again.
I think our Government knew this, which is why they appeared to be so reluctant to go down the official route - the amount of money that would be lost under the first scenario is staggering (the Ukraine sanctions have cost EU businesses around $10 billion a year according to reports; this would be much more than that), and he would probably not survive the second.
