That's all above my paygrade. And completely beyond any of the morons running the US at the moment
Feeding false information to the enemy is a great win - as long as they don't know it was false. But how do you know what they know ? How can you trust what you know ?
A lot of espionage seems to be trying to create elaborate lies that cost very little, but which can tie vast amounts of enemy resources up in wasted effort. I mean if one person in a shed can develop an "operation" that has mythical "sleeper agents" planted deep into the enemies capability - hidden for years with a perfect legend; then the resulting "molehunt" could take hundreds of people over many years to either convince themselves it's true (and thus destabilise their own capability) or take the risk of saying "it's bollocks" with the attendant risks of getting it wrong.
On a more prosaic level, the fact that it's so obvious Nigel Farage is a Russian asset (it's in his Wikipedia entry) and yet not received any (apparent) scrutiny could be part of an elaborate bluff by the UK. The spy equivalent of "Really ? Do try harder Ivan.".
"The Rest is Classified" is over there ->