In a dramatic escalation of tensions, the Kosovo government has demanded that Serbia withdraw its troops from the country's border.
This comes after Serbia allegedly sent tanks and armored vehicles to the border region earlier this week. The move has been condemned by NATO and the European Union, who have urged both sides to de-escalate the situation.
Kosovo's president, Vjosa Osmani, has warned that any further Serbian incursions into Kosovo's territory will be met with "an appropriate response".
Serbia has so far refused to withdraw its troops, insisting that they are there to maintain order and protect its citizens.
The tensions between Kosovo and Serbia have been simmering for years, but recent events have brought them to a boiling point. Kosovo declared independence from Serbia in 2008, but Serbia has never recognized that declaration.
In recent years, both sides have engaged in a tense game of one-upmanship, with Kosovo imposing tariffs on Serbian goods and Serbia building a wall along the border.
This latest move by Kosovo is likely to further inflame tensions, and many are worried that the situation could spiral out of control.
The United States and the European Union have both called for calm and for both sides to return to the negotiating table. The EU has been attempting to broker a deal between Kosovo and Serbia for years, but with little success.
The United States, which played a major role in the Kosovo War of the late 1990s, has also been deeply involved in trying to find a solution.
So far, neither side has shown any willingness to back down, and the situation remains tense.Analysts have warned that a full-blown conflict between Kosovo and Serbia could have major consequences for the region and beyond.
Kosovo is home to NATO's largest base in Europe, and any fighting there could quickly spread to other countries in the region. The conflict could also inflame tensions within Serbia, where there is a large population of ethnic Albanians.
And if the situation is not resolved peacefully, it could undermine the credibility of the EU and NATO, both of which have invested heavily in trying to bring peace to the Balkans.
The crisis also has major implications for the Kosovo economy, which is already struggling under the weight of high unemployment and corruption. Any further disruption to trade with Serbia could lead to even more economic hardship for the people of Kosovo.
Many analysts believe that a solution to the crisis must come through negotiations, but that may be difficult to achieve given the current tensions.
Some have suggested that the EU and the United States may need to take a more active role in resolving the dispute, and that international pressure may be needed to bring both sides to the table.
The roots of the conflict go back to the breakup of Yugoslavia in the 1990s, which led to a series of wars in the region.
Kosovo was once a part of Serbia, but it declared independence in 2008, and has since been recognized by over 100 countries, including the United States and most of the EU.
Serbia, however, still considers Kosovo to be a part of its territory, and has refused to recognize its independence. The dispute has been a major source of tension in the region for years, and has flared up at various points in the past.
The current crisis began in July, when Kosovo imposed tariffs on goods from Serbia, in response to what it saw as Serbia's "unfriendly and uncooperative" behavior. Serbia responded by banning imports from Kosovo and stopping flights between the two countries.
Tensions have continued to rise since then, with both sides engaging in a war of words and making increasingly aggressive statements.
Last week, Serbia's President Aleksandar Vucic warned that Kosovo was "playing with fire," and threatened to use force to protect Serbian interests.