Transnistria is a self-declared, unrecognized breakaway region located along the Dniester River, between Moldova and Ukraine. It covers a land area of about 4,163 square kilometers and has a population of around 500,000 people. The capital city is Tiraspol. Transnistria declared independence from Moldova in 1990, but it has not been recognized by any country, including Russia, despite receiving significant political, economic, and military support from Russia.