How navies might answer a 40,000-ton Chinese surface combatant

If China answered Defiant with a 40,000-ton nuclear-powered surface combatant, how would other navies respond?

Most navies would not build a direct counterpart; submarines could answer its wartime threat, while carriers and visible surface groups would better offset its peacetime diplomatic presence.

The hypothetical ship is treated as both a combatant and a mobile symbol of national status. Britain, France, India, Japan, or South Korea could point to aircraft carriers rather than imitate the design, while the United States and China are the likeliest builders of ships at that scale. Extra submarines might be an efficient wartime response because they could threaten the large combatant directly. Submarines, however, cannot perform the same port-visit and diplomatic functions, especially where nuclear boats are unwelcome. Defeating the ship in war and offsetting its diplomatic influence in peace would require different capabilities.