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Amid doubts about Washington’s commitment to defending its allies, countries in Europe and elsewhere are asking whether America’s nuclear umbrella offers enough protection from Russia and countries looking to build their arsenals, such as North Korea and Iran. WSJ reporter Laurence Norman and Marion Messmer, senior research fellow at Chatham House, discuss what might drive some countries to seek the protection of others or consider building their own nukes. Then, Debak Das, assistant professor at the University of Denver, shares the proliferation risks of a renewed arms race, and what the process of actually building a nuclear program could look like. Luke Vargas hosts. Further Reading  Trump Prompts European Calls for a Homegrown Nuclear Umbrella The Bomb Is Back as the Risk of Nuclear War Enters a New Age  Trump’s Embrace of Putin Has Germany Thinking of Nuclear Weapons  Iran Has Enough Highly Enriched Uranium for Six Nuclear Weapons  Learn more about your ad choices. Visit megaphone.fm/adchoices