"The government has revealed the necessary information to its trusted allies,"
Maybe, maybe not. So far all that supposedly is known is what the poison is. Who made it? and who delivered it? we would not expect to be told anyway. The Russians could have killed the victims before exchanging them. Exchange is not going to work very well in the future, if there is a suspicion cleaning up will be performed at a later date. It all seems to have been solved far too quickly and cleanly for me to believe a word of it. Maybe in 50 years time the true story will come out.