Nukes all around? A fraying U.S. nuclear umbrella is pushing allies to weigh defense options, raising risk of a proliferation cascade

As countries take more responsibility for their own defense and nuclear states step back from arms-control commitments, the question of proliferation arises.

Source: [CNBC](https://www.cnbc.com/2026/08/19/nuclear-proliferation-defense-risk-trump-umbrella-.html)