Scott Neuman

Secretary of State John Kerry says the United States is ready to walk away from the negotiating table if Tehran is unwilling to make the "hard choices" necessary to achieve a deal with the West on limiting its nuclear program.

However, Kerry also said that he and his Iranian counterpart, Mohammad Javad Zarif, were making "genuine progress" on "several of the most difficult issues" that remain to be resolved.

China's central bank will provide an injection of cash for the state-run margin finance company, as the country's top brokerages pledge to go on a share-buying spree to prop up faltering markets that have lost a third of their value in less than a month.

The International Space Station has just received a much-needed delivery, including some groceries, aboard a Russian capsule that successfully docked after three previous attempts to resupply the orbiting laboratory had failed.

Updated at 2:30 a.m. ET Monday:

Greek Finance Minister Yanis Varoufakis has resigned. According to The Associated Press: Varoufakis was told shortly after the Greek referendum result that the some eurozone finance ministers and Greece's other creditors would prefer he not attend the ministers' meetings. He issued an announcement on Monday saying the prime minister had judged that his resignation "might help achieve a deal" and that he was leaving the finance ministry for this reason.

Updated at 8:40 p.m. ET Sunday:

Yukio Amano, the head of the International Atomic Energy Agency, or IAEA, says that if Iran cooperates, the agency could issue a report on the country's past atomic research by the end of the year.

NPR's Peter Kenyon, reporting from Vienna, says that progress is also being reported on sanctions relief for Tehran — but a deal has yet to be finalized.

"With cooperation from Iran, I think we can issue a report by the end of the year," Amano, the head of the U.N. agency, says.

Sixty-two dogs (and buns) after sitting down for the annual Nathan's Famous Hot Dog Eating Contest, Matt Stonie had snatched the title from "Jaws" Chestnut, the reigning eight-time champ, in a competition held each July 4 for nearly a century at New York's Coney Island.

Stonie finished second last year but says he'd been training hard for the rematch. Ultimately, he beat Chestnut by two hot dogs. Coincidentally, both men are from San Jose, Calif.

The Associated Press says: "Afterward, Stonie, holding his fist in the air in victory, said it felt amazing to win."

More than a week after a deadly attack by an Islamic extremist at a Tunisian beachfront resort that killed 38 foreign tourists, the president of the North African country has declared a state of emergency.

President Beji Caid Essebsi's office says in a statement that he needed the powers that come with the declaration to more effectively deal with the threat from extremists.

Three cheers for Lawrence Herkimer, who did more than anyone to transform cheerleading into an art, a science and a multi-million dollar business.

He died of heart failure on Wednesday in Dallas at age 89, according to his family.

Greece's finance minister has accused his nation's creditors of "terrorism" for trying to "instill fear in people" ahead of a referendum on whether to accept the harsh terms of an international bailout designed to keep Athens in the eurozone.

Yanis Varoufakis, in an interview with the Spanish daily El Mundo, said that there was too much at stake for his country to be kicked out of Europe's common currency — "as much for Greece as for Europe, I'm sure."

A sun-powered airplane has landed in Hawaii after a five-day journey from Japan that smashed the previous record of 76 hours for the longest duration nonstop solo flight.

Pilot André Borschberg set the Solar Impulse 2 down on the tarmac at Kalaeloa Airport outside Honolulu after flying for 120 hours from Nagoya, his team reports.

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