Pluto was discovered in 1930 and was originally classified as the 9th planet in our solar system. In 2006 the International Astronomical Union demoted Pluto to a dwarf planet, making it one of the largest dwarf planets.
In terms of diameter, Pluto is only 2,390 km across. For comparison, that's about 70% the diameter of the Moon and only about 18% of Earth's diameter. It would easily fit within Russia's largest east-to-west width of 10,000 km. It would also fit within the largest north-to-south size of 4,000 km.
In terms of volume, Pluto has 6.39 x 109 km3. Even though it sounds like a huge number, it's only 0.59% of Earth's volume. Pluto's mass is 1.3 x 1022 kg, about 18% the mass of the Moon and only 0.2% of Earth's mass. Needless to say, Pluto doesn't have much mass, having only about 6.7% of Earth's gravity.
The surface area of Pluto, at 16,647,940 km2 (6,430,000 mi2), is about 3.3% of Earth's surface area. Pluto is about the same surface area as Russia, the largest country by land mass on Earth, with a surface area of 17,098,322 km2 (6,601,699 mi2).