Why few states build strategic bombers

Will countries beyond the United States, China, and Russia build strategic bombers?

Probably not, except perhaps through a joint European project, because few states combine large-airframe industry with a recurring need for intercontinental strike.

A strategic bomber program demands the ability to design and manufacture very large aircraft, a capability often rooted in a civilian airliner industry. The United States, Russia, and China combine that industrial base with targets far beyond their immediate theaters. Europe could theoretically pursue a joint Airbus-based project, but most European contingencies are reachable with tactical aircraft, tanking, and guided weapons. Without a recurring long-range mission, a specialist bomber fleet is difficult to justify against more flexible strike systems.