Belarus, officially the Republic of Belarus, is a landlocked country in Eastern Europe. It is bordered by Russia to the east and northeast, Ukraine to the south, Poland to the west, and Lithuania and Latvia to the northwest. Belarus covers an area of 207,600 square kilometres (80,200 sq mi), with a population of 9.4 million, and is the thirteenth-largest and the twentieth-most populous country in Europe.

Ukraine is a country in Eastern Europe. It is bordered by Russia to the east and north-east; Belarus to the north; Poland, Slovakia and Hungary to the west; and Romania, Moldova, and the Black Sea to the south. Ukraine also borders Crimea to its south, which Russia annexed from Ukraine in 2014, though Ukraine still continues to claim the territory.