Sweden's policy of neutrality, which became formal in 1834, has kept the country at peace for nearly 200 years. Finland's neutrality is a result of a non-aggression pact with the Soviet Union in 1948. Belgium has withdrawn a threat to close its airspace and the port of Antwerp to US military traffic, which would have prevented the movement of American equipment from Germany to the Gulf. However, the Belgian Prime Minister has criticised the Americans for not abiding by the international framework.