As a result of Đukanović's relationship with the United States, Montenegro received significant amounts of economic aid during this period, and negotiated limitations on NATO bombings of its territory in 1999, whereas the rest of Yugoslavia was subject to significantly heavier attacks. The DPS government gradually severed ties with Serbia by taking control over customs and the economy, introducing first the German mark, and subsequently the Euro as legal tender, and generally reducing the influence of the federal government in Montenegro.