From the best calculations, the surface area of Pluto adds up to 16,650,000 km^2, equivalent to 0.033 Earths. Russia comes out to be 17,098,242 km^2, much larger than the that minor planet out in the middle of nowhere. To be fair, Russia is incredibly large, proudly taking the largest country in the world title.
Pluto is no longer a planet because it doesn't meet one of the three conditions that redefined "planet" in 2006 by the IAU (or International Astronomical Union). The first two, which Pluto meets, is orbiting the sun and massive enough to be a sphere by it's own gravitational force. The final condition, which isn't met, is that the object must clear the neighborhood around it's orbit. Pluto's orbit occasionally comes closer than Neptune, thus failing to orbit it.
