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North Korea's leader Kim Jong-un and President Donald Trump at their U.S.-North Korea summit in Singapore in June. Photo: Saul Loeb/AFP/Getty Images

North Korea issued a stern warning to the U.S. on Sunday about its latest round of sanctions on officials in Pyongyang, cautioning that continued escalation could "block the path to denuclearization on the Korean peninsula forever" and lead "relations back to the status of last year which was marked by exchanges of fire," BBC reports.

Background: Since President Trump’s June summit with North Korean leader Kim Jong-un, denuclearization efforts have been slow, and the Trump administration has sanctioned North Koreans engaging in illegal activities like cyberattacks and money laundering. The latest round of sanctions came last week, when the Treasury Department sanctioned three of Kim's top aides over "serious human rights abuses and censorship."

Go deeper: We're still relying on Trump-Kim chemistry to prevent nuclear war

Go deeper

5 mins ago - Technology

Why domestic terrorists are so hard to police online

Illustration: Eniola Odetunde/Axios

Domestic terrorism has proven to be more difficult for Big Tech companies to police online than foreign terrorism.

The big picture: That's largely because the politics are harder. There's more unity around the need to go after foreign extremists than domestic ones — and less danger of overreaching and provoking a backlash.

Erica Pandey, author of @Work
10 mins ago - Economy & Business

Work-wherever turns to work-whenever

Illustration: Sarah Grillo/Axios

The pandemic killed the 9-to-5 workday for many.

The big picture: So much of our society — from after-school child care programs to the most coveted time slots for television shows — is structured around working from 9 to 5. But our countrywide experiment in remote work has demonstrated that the hours we are logged on don't matter as long as the work gets done.

Ben Geman, author of Generate
39 mins ago - Energy & Environment

Biden's plan to upend Trump's environmental legacy

Illustration: Aïda Amer/Axios. Photo by Brendan Smialowski/AFP via Getty Images

President-elect Joe Biden will on Wednesday order a government-wide review of over 100 Trump-era policies and direct agencies to prepare a suite of emissions and energy efficiency rules.

Why it matters: New information from transition officials offers the full scope of Biden's imminent, inauguration-day burst of environmental and energy policy moves.