Are steam keys worldwide?

So i found a legit russian website where South Park The Stick Of Truth only costs 17$ ( It states that it only works in Russia but aren't steam keys universal? 

yes, not that i'd recommend going through them (not anything about them, just paranoid in general)

Why wouldn't you? You can purchase through paypal.

you have to be careful with translations. sometimes keys only work with a specific language so you might end up with a russian only version of southpark

Oh. Thx for the tip.