(CNN) -- The United States officially recognized Kosovo -- the Balkan province which split from Serbia on Sunday -- as an independent nation on Monday, Secretary of State Condoleezza Rice said in a written statement.
In response, Serbia ordered its ambassador to the United States to return home, the Serbian Embassy said. Serbian President Boris Tadic said Kosovo's move sets a dangerous precedent for other nations with separatist provinces.
Tadic asked the U.N. Security Council to annul the declaration of independence.
"Imagine you were in my place -- the president of a country, which has been deprived of a territory against its will. How would you feel and how would you respond?" he said.
"I'm asking this question of you because if you cast a blind eye to this illegal act, who guarantees to you that parts of your countries will not declare independence in the same way?"
European Union nations Monday were also starting to individually recognize Kosovo as the world's newest nation -- but had not agreed collectively on the way forward.