$25nl AKs on bb vs utg

PokerStars No-Limit Hold'em, $0.25 BB (9 handed) - PokerStars Hand Converter from HandHistoryConverter.com

SB ($19.82)
Hero (BB) ($25)
UTG ($11.99)
UTG+1 ($26.64)
MP1 ($26.03)
MP2 ($27.82)
MP3 ($26.84)
CO ($15.89)
Button ($11.55)

Preflop: Hero is BB with A, K
UTG bets $0.75, 4 folds, CO calls $0.75, 2 folds, Hero raises to $2.50, UTG raises to $4.50, fold, Hero?



Villain is Russian, but seems competent. No HUD running since my desktop is fucked and my lappy is too shit to handle more than one programme. Over a sample of 100ish hands, he's 3bet me once and not shown down anything crazy, in fact I'm not sure he's shown down anything. I'd guess he's running something like 15/14. Zero notes.

I feel this is a pretty easy fold to 4bet, esp given sizing, but should I even be continuing to his utg open? And is my 3bet sizing ok vs a shortie and call monkey in lp? fwiw, CO is a fish, calling too many raises.