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President Obama's decision to lift the arms embargo against Vietnam was about much more than selling weapons. It was about sending a message to China.

Not only may Vietnam begin buying American ships and surveillance equipment, it could also begin hosting regular visits by U.S. military units, including U.S. Navy warships at Cam Ranh Bay. Such trips would put American sailors square into waters that China is claiming it controls, making clear the U.S. rejects those claims and reassuring China's nervous neighbors in the region — or so Washington hopes.

The World Health Organization is trying to ease concerns about spreading Zika as a result of this summer's Olympics in Rio de Janiero.

"Based on current assessment, cancelling or changing the location of the 2016 Olympics will not significantly alter the international spread of Zika virus," a statement released Saturday reads.

A watercolor by scientist-artist David S. Goodsell just might make the Zika virus easier to visualize. The painting, which depicts an area about 110 nanometers wide (a nanometer is a billionth of a meter), shows the virus in the process of infecting a cell.

Shoulder patches are the subject of a diplomatic incident between the U.S. and Turkey. The flap highlights the complicated regional politics the U.S. is navigating in its offensive against Islamic State militants in Syria.

The central issue: the Kurdish YPG militia, which the U.S. views as a key ally against the Islamic State in Syria, has been branded a terrorist group by Turkey's government.

Fresh Air Weekend highlights some of the best interviews and reviews from past weeks, and new program elements specially paced for weekends. Our weekend show emphasizes interviews with writers, filmmakers, actors and musicians, and often includes excerpts from live in-studio concerts. This week:

Marc Maron On Sobriety And Managing His 'Uncomfortable' Comfort Zone: The comic recently played out his own fictional relapse on his IFC show, Maron. He says relapse is "a very real fear of mine. I'm glad it happened in fiction and not in real life."

An Argentine court has sentenced Reynaldo Bignone, the country's last dictator, to 20 years in prison for his part in Operation Condor.

It's the "first time a court has ruled that Operation Condor was a criminal conspiracy to kidnap and forcibly disappear people across international borders," The Associated Press reports.

The political revolution that Bernie Sanders began may still be felt at the ballot box this November even if he's not the Democratic nominee for president.

The Vermont senator is beginning to expand his political network by helping upstart progressive congressional candidates and state legislators, lending his fundraising prowess and national fame to boost their bids.

And win or lose for the White House hopeful, Sanders's candidacy has given them a prominent national messenger and new energy they hope will trickle down-ballot in primaries and the general election.

The Week In Sports

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Obama Makes Historic Visit To Hiroshima

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Copyright 2016 NPR. To see more, visit http://www.npr.org/.

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