Russia has long wanted to bring Ukraine back into it's fold. They'd like Ukraine to become the same kind of "democracy". Vladimir Putin has funneled millions of dollars to support the pro-Russian Presidential candidate. (Where's George Soros when you need him?)
Ukraine is one of those countries where they love Americans so it's kind of exciting to see the people rise up in peaceful revolt against a corrupt election. LSPM claims he's a little short on perspective since he's actually in Independence Square in Kiev, but his posts are pretty informative and worth a look:
How and Why The Election was Stolen, Part 3
Updates from The Front