Good review here.

http://www.fool.com/investing/general/2014/04/30/heard-what-potash-corp-just-said-about-the-russia.aspx

So potash investors actually had a valid reason to bet on the Ukraine conflict. But when an analyst wanted to know what the world's largest potash producer thinks about the situation during its recent earnings call, this is what President and CEO Bill Doyle had to say:

I kind of look at it as a big balloon. The market for potash globally, if you squeeze the air out of it on one side, it tends to pop up on the other. So I don't see any real big impact if tensions should escalate, God forbid in the Ukraine. Say you had the Russians or Belarusians couldn't export to the U.S. market, let's say, it'd show up someplace else. So I don't see it as a major factor.