The Yugoslav navy's mine warfare and countermeasures capabilities were considered adequate in 1990. It operated four Vukov Klanac-class coastal minesweepers built on a French design, four British Ham class minesweepers, and six 117-class inshore minesweepers built in domestic shipyards. Larger numbers of older and less capable minesweepers were mainly used in riverine operations. Other older units were used as dedicated minelayers. The navy used amphibious landing craft in support of army operations in the area of the Danube, Sava, and Drava rivers. They included both tank and assault landing craft. In 1990, there were four 501-class, ten 211-class, and twenty-five 601-class landing craft in service. Most of them were also capable of laying mines in rivers and coastal areas.