вешать лапшу на уши
veshat’ lapshu na ushi
I came across this phrase when googling for the Russian word for lying about something when everyone knows what’s being said is a lie. This came up in relation to Russia’s insistence that it was not involved in the Salisbury novichok poisonings, but also a number of other previous incidents denied by Russian president Vladimir Putin. The phrase implies that someone is bluffing, deliberately fighting their corner while knowing the reality that they are denying is true.