Klaus criticised NATO bombing of Yugoslavia during the Kosovo War, and was subsequently a frequent critic of the unilateral Kosovo declaration of independence. During a visit to Slovakia in March 2008, Klaus stated his disagreement with the argument that Kosovo was an exceptional case, and suggested that the precedent set by the recognition of Kosovo would open a "Pandora's box" in Europe, leading to disastrous consequences. He compared the situation of Serbia to the 1938 Munich Agreement. When Serbia recalled its ambassador in protest at the Czech government's recognition of Kosovo, Klaus invited the Serbian ambassador to Prague Castle for a friendly farewell. During a visit to Serbia in January 2011, Klaus stated that as long as he was president the Czech Republic would not appoint an ambassador to Kosovo.