From the Overview: "The Republic of Kosovo is a landlocked country in the Western Balkans. Ethnic Albanians comprise about 90% of Kosovo's population, and Serbs and other minority groups comprise about 10%. Kosovo declared independence from Serbia in 2008, nearly a decade after the end of a brief but lethal conflict between Serbian forces and a Kosovo Albanian insurgency led by the Kosovo Liberation Army (KLA). Since 2008, Kosovo has been recognized by more than 100 countries. The United States and most European Union (EU) member states recognize Kosovo. Serbia, Russia, China, and various other countries (including some EU member states) do not. The United States has strongly supported Kosovo's state-building and development efforts, as well as an EU-led dialogue aimed at normalizing Kosovo and Serbia's relations. Kosovo generally regards the United States as a security guarantor and key ally. Congress has maintained interest in Kosovo for many decades--from concerns over Serbia's treatment of ethnic Albanians in the former Yugoslavia to the armed conflict in Kosovo in 1998- 1999 after Yugoslavia disintegrated. Many Members were active in debates over the U.S.- and NATO-led military intervention in the conflict. After Serbian forces withdrew in 1999, many Members backed Kosovo's independence. Today, many in Congress continue to support Kosovo through country- or region-specific hearings, congressional visits, and foreign assistance funding levels averaging around $50 million in recent years."
CRS Report for Congress, R46175
Congressional Research Service: https://crsreports.congress.gov/