Kentucky is about 2 times smaller than Belarus.

Belarus is approximately 207,600 sq km, while Kentucky is approximately 102,896 sq km, making Kentucky 49.56% the size of Belarus. Meanwhile, the population of Belarus is ~9.4 million people (5.1 million fewer people live in Kentucky).
Tip: This to-scale comparison of Belarus vs. Kentucky uses the Mercator projection, which distorts the size of regions near the poles.