Y-Duen Buondap, a Vietnam War veteran, carries a poster with photographs of dead Mexicans who said they served in the U.S. Army as soldiers under the promise of becoming a citizens but ended up deported, during a protest to mark Memorial Day near the Cordova-Americas international border crossing bridge, in Ciudad Juarez, Mexico, May 31, 2021. REUTERS/Jose Luis Gonzalez

Visitors pay respects to fallen service members at the Vietnam Veterans Memorial on the National Mall in Washington, DC. U.S., in Washington, U.S., May 31, 2021. REUTERS/Michael A. McCoy

A makeshift memorial is seen in front of the Vietnam Memorial in observance of Memorial Day in Washington, U.S., May 31, 2021. REUTERS/Michael A. McCoy

A makeshift memorial is seen in front of the Vietnam Memorial in observance of Memorial Day in Washington, U.S., May 31, 2021. REUTERS/Michael A. McCoy

Visitors pay respects to fallen service members, at the Vietnam Veterans Memorial on the National Mall in Washington, DC. U.S., in Washington, U.S., May 31, 2021. REUTERS/Michael A. McCoy

Veterans pay respects to fallen comrades at the Vietnam Veterans Memorial on the National Mall in Washington, DC. U.S., in Washington, U.S., May 31, 2021. REUTERS/Michael A. McCoy

Veterans pay respects to fallen comrades at the Vietnam Veterans Memorial on the National Mall in Washington, DC. U.S. in Washington, U.S., May 31, 2021. REUTERS/Michael A. McCoy

Vietnam War veterans pay respect to fallen comrades at the Vietnam Veterans Memorial on the National Mall in Washington, DC. U.S., in Washington, U.S., May 31, 2021. REUTERS/Michael A. McCoy

Visitors honor service members in remembrance of Memorial Day at the Vietnam Veterans Memorial on the National Mall in Washington, DC. U.S., May 31, 2021. REUTERS/Michael A. McCoy

The Vietnam Veterans Memorial is seen on the National Mall in Washington, DC. U.S., May 31, 2021. REUTERS/Michael A. McCoy

A visitor pays respect to a fallen service member at the Vietnam Veterans Memorial on the National Mall in Washington, DC. U.S., May 31, 2021. REUTERS/Michael A. McCoy

A makeshift memorial lays in front of the Vietnam War Memorial in observance of Memorial Day in Washington, U.S., May 31, 2021. REUTERS/Michael A. McCoy

A visitor pays respect to a fallen service member at the Vietnam Veterans Memorial on the National Mall in Washington, DC. U.S., May 31, 2021. REUTERS/Michael A. McCoy

A Vietnam War veteran pays respect to fallen comrades at the Vietnam Veterans Memorial on the National Mall in Washington, DC. U.S. in Washington, U.S., May 31, 2021. REUTERS/Michael A. McCoy

A Vietnam veteran enjoys music at Coney Island during Memorial Day weekend celebrations in New York, U.S., May 31, 2021. REUTERS/Eduardo Munoz

A Vietnam veteran enjoys the day at Coney Island during Memorial Day weekend celebrations in New York, U.S., May 31, 2021. REUTERS/Eduardo Munoz

A woman sells food next to a banner reading "prevent the spread of COVID-19, take away only, please keep your distance 2 meters" amid the coronavirus disease (COVID-19) outbreak in Hanoi, Vietnam, May 31, 2021. REUTERS/Thanh Hue

A man sits outside a closed coffee shop amid the coronavirus disease (COVID-19) outbreak in Hanoi, Vietnam, May 31, 2021. REUTERS/Thanh Hue

A man buys goods at a shop covered with plastic amid the coronavirus (COVID-19) pandemic, in Hanoi, Vietnam, May 31. REUTERS/Thanh Hue

A man rides a bike on an empty street amid the coronavirus (COVID-19) pandemic, in Hanoi, Vietnam, May 31. REUTERS/Thanh Hue

A woman wears a protective mask as she exercises on the street amid the coronavirus (COVID-19) pandemic, in Hanoi, Vietnam, May 31. REUTERS/Thanh Hue

People fill out their ballots during a parliament election, in Hanoi, Vietnam, May 23, 2021. REUTERS/Thanh Hue

A woman casts her ballot during a parliament election, in Hanoi, Vietnam, May 23, 2021. REUTERS/Thanh Hue

A woman has her temperature checked as she lines up to a polling station during a parliament election, in Hanoi, Vietnam, May 23, 2021. REUTERS/Thanh Hue

A man leaves a polling station during a parliament election, in Hanoi, Vietnam, May 23, 2021. REUTERS/Thanh Hue

People queue to cast their ballots during a parliament election, in Hanoi, Vietnam, May 23, 2021. REUTERS/Thanh Hue

Women cast their ballots during a parliament election, in Hanoi, Vietnam, May 23, 2021. REUTERS/Thanh Hue

A man cast his ballot during parliament election, in Hanoi, Vietnam, May 23, 2021. REUTERS/Thanh Hue

People ride on the street decorated to promote the election day as Vietnamese went to the polls, in Hanoi, Vietnam, May 23, 2021. REUTERS/Thanh Hue

Local officials prepare a polling station ahead of upcoming elections in Hanoi, Vietnam, May 19, 2021. Picture taken May 19, 2021. REUTERS/Thanh Hue

A local official waits for residents to collect election papers in a polling station ahead of upcoming elections in Hanoi, Vietnam, May 19, 2021. Picture taken May 19, 2021. REUTERS/Thanh Hue

People stand around a place that will be a polling station for the upcoming elections, on a street in Hanoi, Vietnam, May 19, 2021. Picture taken May 19, 2021. REUTERS/Thanh Hue

A billboard promoting Vietnam's National Assembly vote ahead of upcoming elections is seen on the street in Hanoi, Vietnam, May 19, 2021. Picture taken May 19, 2021. REUTERS/Thanh Hue

A vendor walks in an alley decorated with national flags ahead of the upcoming elections in Hanoi, Vietnam, May 19, 2021. Picture taken May 19, 2021. REUTERS/Thanh Hue

People stand around a place that will be a polling station for the upcoming elections in Hanoi, Vietnam, May 19, 2021. Picture taken May 19, 2021. REUTERS/Thanh Hue

A woman stands next to a place that will be a polling station for the upcoming elections in Hanoi, Vietnam, May 19, 2021. Picture taken May 19, 2021. REUTERS/Thanh Hue

Tran To Nga, a French-Vietnamese woman, who claims she was a victim of Agent Orange, attends a news conference in Paris, the day after a French court threw out her lawsuit against more than a dozen multinationals that produced and sold the toxic herbicide used by U.S. troops during the war in Vietnam, France, May 11, 2021. REUTERS/Sarah Meyssonnier

Tran To Nga, a French-Vietnamese woman, who claims she was a victim of Agent Orange, attends a news conference in Paris, the day after a French court threw out her lawsuit against more than a dozen multinationals that produced and sold the toxic herbicide used by U.S. troops during the war in Vietnam, France, May 11, 2021. REUTERS/Sarah Meyssonnier

Nguyen Van Bon, member of the Union Generale des Vietnamiens de France (UGVF), and Tran To Nga, a French-Vietnamese woman, who claims she was a victim of Agent Orange, attend a news conference in Paris, the day after a French court threw out her lawsuit against more than a dozen multinationals that produced and sold the toxic herbicide used by U.S. troops during the war in Vietnam, France, May 11, 2021. REUTERS/Sarah Meyssonnier

Amelie Lefebvre, Tran To Nga's lawyer, is seen on a screen as Tran To Nga, a French-Vietnamese woman, who claims she was a victim of Agent Orange, politician Helene Luc listen to during a news conference in Paris, the day after a French court threw out her lawsuit against more than a dozen multinationals that produced and sold the toxic herbicide used by U.S. troops during the war in Vietnam, France, May 11, 2021. REUTERS/Sarah Meyssonnier

Kim Vo Dinh, member of Collectif Vietnam-Dioxine, Nguyen Van Bon, member of the Union Generale des Vietnamiens de France (UGVF), Tran To Nga, a French-Vietnamese woman, who claims she was a victim of Agent Orange, politician Helene Luc and Amelie Lefebvre, Tran To Nga's lawyer, attend a news conference in Paris, the day after a French court threw out her lawsuit against more than a dozen multinationals that produced and sold the toxic herbicide used by U.S. troops during the war in Vietnam, France, May 11, 2021. REUTERS/Sarah Meyssonnier

Tran To Nga, a French-Vietnamese woman, who claims she was a victim of Agent Orange, reacts during a news conference in Paris, the day after a French court threw out her lawsuit against more than a dozen multinationals that produced and sold the toxic herbicide used by U.S. troops during the war in Vietnam, France, May 11, 2021. REUTERS/Sarah Meyssonnier

Tran To Nga, a French-Vietnamese woman, who claims she was a victim of Agent Orange, attends a news conference in Paris, the day after a French court threw out her lawsuit against more than a dozen multinationals that produced and sold the toxic herbicide used by U.S. troops during the war in Vietnam, France, May 11, 2021. REUTERS/Sarah Meyssonnier

Fruit sellers wait for customers at Cai Rang floating market on Mekong river, in Can Tho, Vietnam, May 5, 2021. REUTERS/Thanh Hue

A fruit seller loads his boat as he waits for customers at Cai Rang floating market on Mekong river, in Can Tho, Vietnam, May 5, 2021. REUTERS/Thanh Hue

A man sits on his boat at Cai Rang floating market on Mekong river, in Can Tho, Vietnam, May 5, 2021. REUTERS/Thanh Hue

Fruit sellers ride on their boat as they wait for customers at Cai Rang floating market on Mekong river, in Can Tho, Vietnam, May 5, 2021. REUTERS/Thanh Hue

People sit on their boats as they wait for customers at Cai Rang floating market on Mekong river, in Can Tho, Vietnam, May 5, 2021. REUTERS/Thanh Hue TPX IMAGES OF THE DAY

A man sells food at Cai Rang floating market on Mekong river, in Can Tho, Vietnam, May 5, 2021. REUTERS/Thanh Hue

A food seller sails her boat as she waits for customers at Cai Rang floating market on Mekong river, in Can Tho, Vietnam, May 5, 2021. REUTERS/Thanh Hue

A Vietnam Airlines plane takes off through a layer of smoke from hazard reduction burns, resulting in a poor air quality alert issued for parts of the city, in Sydney, Australia, May 3, 2021. REUTERS/Loren Elliott

Relatives of a shrimp farmer Ta Thi Thanh Thuy eat dinner at her house in Soc Trang province, Vietnam, May 1, 2021. Picture taken May 1, 2021. REUTERS/Thanh Hue

An altar is seen in front of a shrimp farm pool in Soc Trang province, Vietnam, May 1, 2021. Picture Taken May 1, 2021. REUTERS/Thanh Hue

Shrimp farmers Ta Thi Thanh Thuy and her husband Tran Ngoc Giau have lunch at her house in Soc Trang province, Vietnam, May 1, 2021. Picture taken May 1, 2021. REUTERS/Thanh Hue

Ta Thi Thanh Thuy, 52, prays in front of her house in Soc Trang province, Vietnam, May 1, 2021. Picture taken May 1, 2021. REUTERS/Thanh Hue

Ta Thi Thanh Thuy, 52, walks past the place where she used to grow rice before her family switched to shrimps farming in Soc Trang province, Vietnam, May 1, 2021. Picture Taken May 1, 2021. REUTERS/Thanh Hue

Shrimp farmer Tran Ngoc Giau rests at his house in Soc Trang province, Vietnam, May 1, 2021. Picture Taken May 1, 2021. REUTERS/Thanh Hue TPX IMAGES OF THE DAY

Farmers prepare former rice fields into pools to farm shrimps in Soc Trang province, Vietnam, April 28, 2021. Picture taken April 28, 2021. REUTERS/Thanh Hue

Shrimp farmers load a truck with harvested shrimps in Soc Trang province, Vietnam, April 27, 2021. Picture taken April 27, 2021. REUTERS/Thanh Hue

Former rice fields turned into pools to farm shrimps are seen in Soc Trang province, Vietnam, April 27, 2021. Picture taken with drone on April 27, 2021. REUTERS/Thanh Hue