A fanatic is one who can't change his mind and won't change the subject.
A lie gets halfway around the world before the truth has a chance to get its pants on.
Assuming that sanctions go ahead, then we are looking at reciprocal actions from Russia, though they won't have much affect on the US directly, the EU will feel them to a more or less extent and that would tangentially affect us in some markets. Basically, the market will lose another few percent or more until things stabilize.
Then the question will really become, what will Putin do next if anything. Will he eye eastern Ukraine thinking that we've exhausted our commitment and political capital? Will he try to force-ably evict the Ukrainian bases in Crimea, thereby provoking war with Ukraine? Will he completely turn off the gas pipes to the EU (which would hurt him just as much as it would the EU)? Or will he realize the difficult economic position he's putting himself in, ratchet down the tension, negotiate with the Ukraine, and simply settle for the same old international agitation that has characterized his dictatorship.
Killing one person is murder, killing 100,000 is foreign policy
I believe it is giving Putin waaaay too much credit to think he engineered this. He is responding to a revolt in the Ukraine that threatens a strategic interest in the Black Sea. He didn't send in millions of ethnic Russians over the years to tip the demographics. He is trying to maintain the Military bases Russia has had since before the Crimean war in the 1850's.
A prime minister isn't elected in some sort of voting system by the general population such as our President through an electoral college. He is most often appointed by the majority party in Parliament. So it doesn't matter if the new Prime Minister ever won an election by popular vote, it only matters that the Parliament sees him as a worthy PM.
Putin holds all the aces, but he didn't draw any of them- they were dealt to him.
Putin will offer Kerry a set of matryoshka dolls and Kerry will come back to the US claiming victory.