Question: For what major conflict is the country on the natural boundary between the country that hosted the tournament and the country where A Don is from known?

Knowledge 1: A Don
A Don is a village in south-eastern Laos near the border with Vietnam. It is located in Kaleum District in Sekong Province. [SEP] Knowledge 2: 2018 FIFA World Cup
2018 FIFA World Cup Чемпионат мира по футболу 2018 (Chempionat mira po futbolu 2018) Tournament details Host country Russia Dates 14 June -- 15 July Teams 32 (from 5 confederations) Venue (s) 12 (in 11 host cities) ← 2014 2022 → [SEP] Knowledge 3: 2017 FIFA Confederations Cup
Russia was announced as the host on 2 December 2010 after the country was awarded the hosting rights of the 2018 FIFA World Cup. The matches were played in four different stadiums across four cities: Saint Petersburg, Moscow, Kazan, and Sochi. It was the first time Russia has hosted the tournament, and the third time the Confederations Cup has been held in the European continent. As hosts, Russia qualified automatically for the tournament; they were joined by the six winners of the FIFA confederation championships and the 2014 FIFA World Cup champions, Germany. [SEP] Knowledge 4: Ice hockey at the 2018 Winter Olympics – Men's tournament
The men's tournament in ice hockey at the 2018 Winter Olympics was held in Gangneung, South Korea between 14 and 25 February 2018. Twelve countries qualified for the tournament; eight of them did so automatically by virtue of their ranking by the International Ice Hockey Federation, one, South Korea, automatically qualified as hosts, while the three others took part in a qualification tournament.
Knowledge 1: A Don
A Don is a village in south-eastern Laos near the border with Vietnam. It is located in Kaleum District in Sekong Province. [SEP] Knowledge 2: 1998 FIFA World Cup
The tournament was won by host country France, who beat defending champions Brazil 3 -- 0 in the final. France won their first title, becoming the seventh nation to win a World Cup, and the sixth (after Uruguay, Italy, England, West Germany and Argentina) to win the tournament on home soil. Croatia, Jamaica, Japan and South Africa made their first appearances in the finals. [SEP] Knowledge 3: UEFA Euro 2016 Final
The UEFA Euro 2016 Final was a football match that took place on 10 July 2016 at the Stade de France in Saint - Denis, France, to determine the winners of UEFA Euro 2016. Portugal defeated the hosts and two - time winners France 1 -- 0 after extra time, with a goal from substitute Eder, to claim its first major tournament title. In doing so, they became the tenth nation to win the UEFA European Championship, 12 years after losing their first final at home in 2004. France became the second host team to lose the final, after Portugal in 2004, and suffered their first defeat at a major tournament hosted in the country since the 1960 European Nations' Cup third - place playoff against Czechoslovakia. This was the fifth European Championship final to end in a draw after 90 minutes of play, and the second whose winners were decided by extra time, after the inaugural final in 1960. [SEP] Knowledge 4: 2016 FIFA Club World Cup
The 2016 FIFA Club World Cup (officially known as the FIFA Club World Cup Japan 2016 presented by Alibaba YunOS Auto for sponsorship reasons) was the 13th edition of the FIFA Club World Cup, a FIFA - organised international club football tournament between the champion clubs from each of the six continental confederations, as well as the national league champion from the host country. The tournament was hosted by Japan. Real Madrid won their second Club World Cup, defeating hosts Kashima Antlers in the final.
Knowledge 1: A Don
A Don is a village in south-eastern Laos near the border with Vietnam. It is located in Kaleum District in Sekong Province. [SEP] Knowledge 2: 1998 FIFA World Cup
The tournament was won by host country France, who beat defending champions Brazil 3 -- 0 in the final. France won their first title, becoming the seventh nation to win a World Cup, and the sixth (after Uruguay, Italy, England, West Germany and Argentina) to win the tournament on home soil. Croatia, Jamaica, Japan and South Africa made their first appearances in the finals. [SEP] Knowledge 3: UEFA Euro 2016 Final
The UEFA Euro 2016 Final was a football match that took place on 10 July 2016 at the Stade de France in Saint - Denis, France, to determine the winners of UEFA Euro 2016. Portugal defeated the hosts and two - time winners France 1 -- 0 after extra time, with a goal from substitute Eder, to claim its first major tournament title. In doing so, they became the tenth nation to win the UEFA European Championship, 12 years after losing their first final at home in 2004. France became the second host team to lose the final, after Portugal in 2004, and suffered their first defeat at a major tournament hosted in the country since the 1960 European Nations' Cup third - place playoff against Czechoslovakia. This was the fifth European Championship final to end in a draw after 90 minutes of play, and the second whose winners were decided by extra time, after the inaugural final in 1960. [SEP] Knowledge 4: 2018 FIFA World Cup
2018 FIFA World Cup Чемпионат мира по футболу 2018 (Chempionat mira po futbolu 2018) Tournament details Host country Russia Dates 14 June -- 15 July Teams 32 (from 5 confederations) Venue (s) 12 (in 11 host cities) ← 2014 2022 →

Answer: one of the world's longest-running ongoing civil wars.