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Vladimir Putin shoots an advanced Kalashnikov sniper rifle during a visit to the military-themed Patriot Park outside Moscow, in September. Photo: Alexey Nikolsky/AFP/Getty Images

"The deep chill in U.S.-Russian relations is stirring concern ... that Washington and Moscow are in danger of stumbling into an armed confrontation that, by mistake or miscalculation, could lead to nuclear war," AP's Bob Burns writes.

Why it matters: "Unlike during the Cold War, when generations lived under threat of a nuclear Armageddon, the two militaries are barely on speaking terms."

  • "American and European analysts and current and former U.S. military officers say the nuclear superpowers need to talk more."
  • "A foundational arms control agreement is being abandoned and the last major limitation on strategic nuclear weapons could go away in less than two years."

Go deeper: Putin warns of growing threat of nuclear war

Go deeper

Bryan Walsh, author of Future
2 hours ago - Health

Why we need to know COVID's origins

The WHO's headquarters in Geneva. Photo: Fabrice Coffrini/AFP via Getty Images

Geopolitical tensions are foiling efforts to get to the bottom of how COVID-19 originated.

Why it matters: Insights into how COVID-19 began can help us prevent future pandemics — especially if it involved any kind of leak or accident at a virology lab.

Updated 4 hours ago - Politics & Policy

Senate pulls all-nighter on amendments to COVID relief package

Photo: Alex Wong/Getty Images

Democratic leaders struck an agreement with Sen. Joe Manchin (D-W.V.) on emergency unemployment insurance late Friday, clearing the way for Senate action on President Biden's $1.9 trillion stimulus package to resume after an hours-long delay.

The state of play: The Senate continued to work through votes on a marathon of amendments overnight into Saturday morning.