Other European nations have been more circumspect but have not entirely dismissed the possibility. Germany, despite its strong anti-nuclear sentiment domestically, has seen some security analysts argue that European deterrence cannot rely indefinitely on potentially unreliable American guarantees. Even traditionally neutral nations like Sweden and Finland—now NATO members—have begun discussing what independent deterrence might entail.

The Pentagon's opposition reflects multiple concerns. First, nuclear proliferation runs contrary to decades of American nonproliferation policy. The United States has invested enormous diplomatic capital in preventing weapons spread, and European proliferation would catastrophically undermine that effort. Second, independent European nuclear programs could reduce American influence over NATO strategic planning and potentially lead to autonomous European security structures that exclude Washington.

There are also practical considerations. Developing nuclear weapons requires substantial investment in fissile material production, weapons design, delivery systems, and command and control infrastructure. For most European nations, this would represent a multi-decade, multi-billion dollar undertaking that would divert resources from conventional military capabilities that are already inadequate.

However, the discussion reveals the fundamental tension in the current moment: European nations are being told to develop strategic autonomy and take greater responsibility for their own defense, but they are simultaneously being told that certain capabilities—particularly nuclear weapons—remain off-limits. This creates a logical contradiction that European officials find increasingly difficult to navigate.

French President Emmanuel Macron has proposed extending France's nuclear deterrent to cover other European nations, effectively creating a European nuclear umbrella independent of the United States. However, this idea has gained limited traction. France's arsenal is significantly smaller than America's, and many European nations question whether Paris would truly risk nuclear retaliation to defend Poland or the Baltic states.

The British perspective has been characteristically ambiguous. London maintains its own nuclear deterrent but coordinates closely with the United States through the Special Relationship. British officials have suggested that the UK arsenal could play a greater role in European deterrence, but have not articulated how this would work in practice, particularly after Brexit reduced Britain's formal ties to continental security structures.

Arms control experts warn that European nuclear proliferation could trigger a broader unraveling of the nonproliferation regime. If Poland or other European nations acquire nuclear weapons, it would provide justification for Iran, Saudi Arabia, Turkey, and other nations to pursue their own programs. The resulting world of widespread nuclear capabilities would be far more dangerous than the current system.