Roberta Jacobson, the U.S. ambassador to Mexico, has handed in her resignation. The career diplomat, with more than 30 years in government service says it was a difficult decision to leave. Jacobson, 57, is the latest in a string of high-level diplomats to depart the State Department since President Trump took office.

In a note to embassy staff, Jacobson said, "The decision is all the more difficult because of my profound belief in the importance of the U.S.–Mexico relationship and knowledge that it is at a crucial moment."

Tensions at the Trump International Hotel and Tower in Panama City erupted into chaos this week, with teams of security guards attacking each other and police carting off an employee in handcuffs, members of the luxury building's owners association tell NPR.

New Zealand police say they are re-examining an apparent assassination attempt against Queen Elizabeth II.

Declassified documents from New Zealand's intelligence service, newly released to an investigative journalist at the news website Stuff, indicate that there may have been a cover-up after teenager Christopher Lewis fired at the queen's motorcade in Dunedin.

For more than 60 years, it has been the standard of care to try to speed up childbirth with drugs, or to perform a cesarean section if labor was seen as progressing too slowly.

Now a new set of recommendations is changing the game.

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On the Oscars telecast Sunday night, a presenter will read the names of five nominees for the best foreign language film. Missing from that list is one highly acclaimed film, "Foxtrot" from Israel. And critic Bob Mondello says that's a shame.

Employees in South Korea work long hours: 2,069 hours per worker annually – the second-highest among the Economic Cooperation and Development states, after Mexico. In the United States, that figure is 1,783.

Stemming from Siberia then sweeping south to the Mediterranean and west across much of Europe, unusual cold and snow are bringing picturesque vistas — as well as misery and turmoil — this week.

Airports have ground to a halt, schools have shut down, and several people have died.

Updated at 5:14 p.m. ET

President Trump promised steel and aluminum executives Thursday that he will levy tariffs on imports of their products in coming weeks. He said the imported steel will face tariffs of 25 percent, while aluminum will face tariffs of 10 percent.

"We're going to build our steel industry back and we're going to build our aluminum industry back," Trump told reporters.

Updated 9:55 a.m. ET

President Vladimir Putin said in his annual state-of-the-nation speech that Russia has tested powerful nuclear weapons that render missile defense systems useless.

Those weapons include cruise missiles, nuclear-powered underwater drones and a new hypersonic missile that travels five times the speed of sound.