I don't believe so. I'm stacking here all the time. I have folding KK pre exctly one time and that involved a three handed pot where both other players were all in and effective stacks were 200BB+. I'm firmly in the camp of never folding KK pre for 100(ish)BB stacks.

SB very good Russian reg - maybe the first time this has ever been written on the Internet :D.

Does SB have anything other than AA? - I think only you can REALLY answer this question based on how you view him. As a default though, most of the time when people over call half their stack like this it's usually AA with a 20% chance it being QQ-KK/AK from my own EXP. But if he's a good reg I think he should be jamming here with his AA instead of calling as calling looks strong AF.

I lean towards a call myself because the BTN is added value and dead money of $23.

@Harvie It's 2016, Russians own the High Stakes mate.

I'm happy to get this in pre.

Once SB calls we know he 3 bet with a value range happy to stack off against a half stack, but your cold 4 bet range will also be at its widest so I would expect him to sometimes take this line with KK-JJ hoping you give him value by jamming some air hands.

Do you have much of a history with cold 4 betting yourself? How wide is your bluff range in this spot?

Yeah, I have bluffs there and Russian probably knows it. I'll cold 4bet bluff him AQo, AJo sometimes, AXs hands.

I think I only do this with AA and mayyyybe KK vs aggro cold 4bettor.

Know what your saying, know how your feeling in this type of spot, happened to me a fair few times and I've cried about not making the fold too having been shown the rockets. Reality is your still never ever doing anything but getting it in with ~100bbs, fold and give yourself a pat on the back for being a hero every once in a while if ya like but it really doesn't matter it's not happening often enough to make it all that relevant.