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Nikolai Glushkov, a Russian businessman who has been living in exile in the U.K., was found dead in his home late Monday night, the Guardian reports. The circumstances of his death are not immediately clear.

Why it matters: Glushkov is an ally of Boris Berezovsky, the late oligarch who was Putin's top foe in the West until his death in 2013. The fact that Glushkov's death comes so soon after the poisoning of Sergei Skripal, and with the U.K. threatening a response, has intensified the scrutiny surrounding it.

Go deeper

Biden confronts mounting humanitarian crisis at the border

Illustration: Eniola Odetunde/Axios. Photo: Pool/Getty Images     

Just over a month into his presidency, President Biden is staring down a mounting crisis at the border that could be just as bad as the ones faced by Barack Obama and Donald Trump, if not worse.

Why it matters: Immigration is an issue that can consume a presidency. It's intensely and poisonously partisan. It's complicated. And the lives and welfare of vulnerable children hang in the balance.

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

The rise of vaccine passports

Illustration: Annelise Capossela/Axios

Vaccine passports were touted early in the pandemic as an important piece of the plan to get people back to normal life. Now they’re becoming a reality.

Driving the news: CLEAR, the secure digital identity app that you see in airports around the world, and CommonPass, a health app that lets users securely access vaccination records and COVID test results, have joined forces.

"Vaccine tourism" stretches states' supplies

Illustration: Sarah Grillo/Axios

Americans who are highly motivated to get vaccinated are traveling across state lines after hearing about larger vaccine supplies or loopholes in sign-up systems.

Why it matters: "Vaccine tourism" raises ethical and legal questions, and could worsen the racial socioeconomic and racial inequalities of the pandemic.