The United States is by far the most dominant power. The US Navy alone has a greater tonnage than the second and third contenders combined (Russia and China). Its eleven nuclear aircraft carriers, along with its impressive amphibious capabilities and logistics support resources, serve to illustrate the strategy of imposing a formidable presence on the seas – put forward by Admiral A.T. Mahan at the close of the 19th century – which proved to be very effective during the two 20th-century world wars. Russia, in contrast, is trailing far behind – with naval resources requiring modernisation – despite the Soviet period, which, notably under Admiral Gorchov (1956-1985), had enabled the country to build up a powerful force, especially for submarines. China is currently also developing its naval forces and trying to expand over and beyond its regional scope, unlike most other navies. The only exceptions are the United Kingdom and France, whose remarkable histories have given them control of vast maritime areas. These two states therefore have projection forces backed up by distant naval bases with undoubtedly modest yet real resources in place.