Angering Serbia and its allies, such as Russia, Kosovo, already a semi-autonomous province, proclaimed its independence from Serbia today, in a long-awaited move.
Kosovo's parliament has unanimously endorsed a declaration of independence from Serbia, in an historic session.
The declaration, read by Prime Minister Hashim Thaci, said Kosovo would be a democratic country that respected the rights of all ethnic communities.
The US and a number of EU countries are expected to recognise Kosovo on Monday.
Serbia's PM denounced the US for helping create a "false state". Serbia's ally, Russia, called for an urgent UN Security Council meeting.
To understand the reasons for the Kosovo divide, one must understand the problems the former Yugoslavia faced, and is still facing right now (i.e. the Kosovo War).
This will add to the strain in relations between Russia and the West.