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Ayatollah Ali Khamenei, Iran's supreme leader, said Sunday that all U.S. sanctions must end before Tehran will return to its commitment under the 2015 nuclear accord.

New research found that wearing a cloth mask over a medical mask significantly boosts protection against droplets that can transmit the virus. Knotting the ear loops of surgical masks also helps.

The EU says Amazon exploits data collected from other sellers for its own benefit. These are the first formal charges against the retail giant in a spate of antitrust probes in Europe and the U.S.

Nearly two years after the Trump administration told U.S. telecom providers to replace Chinese equipment for national security reasons, they're still waiting on federal guidance and funding.

President Biden is set to give his first address to a foreign — yet familiar — audience at the virtual Munich Security Conference on Friday.

As she takes the helm of the World Trade Organization, the former Nigerian finance minister faces challenges from COVID-19 response to navigating trade frictions between the U.S. and China.

Michigan's top Republican lawmakers are reportedly headed to the White House Friday. Trump's campaign is trying to challenge votes from heavily Democratic parts of the state without success in court.

Last year, Missouri voters approved a ballot measure to expand Medicaid. But Republican lawmakers refused to appropriate money to fund it. Now, a legal battle is all but certain.

President Biden says he's open to diplomatic talks with North Korea. Former presidents have failed to make any significant progress toward North Korea giving up its nuclear weapons.

Regulators say Mexico is not complying with international air safety standards, and have limited Mexican airlines' access to the U.S., just as passenger traffic is picking up from the pandemic.