US-Russia diplomacy

You've gotta include this in the discussion,

Poland and the United States reached an agreement Thursday that will see a battery of American missiles established inside Poland, the prime minister said, announcing a plan that has infuriated Russia and raised the specter of an escalation of tension with the region's communist-era master.

The next thing I'm watching for is whether (and how) the Russians might respond within the context of the Iran nuclear negotiations.