In my opinion, ever since the old times, when the sport was not so popularized, and only very developed powers could conduct sports contests, this was already an interesting type of activity and was quite popular. And now, when athletics are of interest to almost everyone, it really can be a way to build relationships.
Firstly, countries organize different types of competitions among themselves to prove that one is better than the other. Global sporting events can unite people regardless of their views on politics or religion. And it helps to keep the world in peace till today. International sport can keep it in peace for many years, but we have to work on it. For example, the Olympic Games, countries from around the world are competing and trying to prove that they are better. But there are exceptions to this, we all love to win and a few who know how to lose, so such competitions can complicate relations between countries.
Secondly, we all have a touch of nationalism when we want to show others that we and our country are better, but war is not the best way, and sport helps us again. Many wars based on nationalist beliefs could not be stopped thanks to sports, but to dilute the situation between the powers with some kind of sports competition would be quite real. For example, I believe that in our country, there is some confrontation between the east and the west of Ukraine and they solve their conflicts in sport, Ukrainian football, basketball or hockey teams meet to decide who is better, this is the right way to resolve such conflicts.
In the end, I would say that sport unites people from different countries and the countries themselves, but you should not base politics only on it, because sometimes it can only complicate relations. International sport is very useful for relationship to the Earth. 
In my opinion, ever since the  
old
 times, when the  
sport
 was not  
so
 popularized, and  
only
  very
 developed powers could conduct  
sports
 contests, this was already an interesting type of activity and was quite popular. And  
now
, when athletics are of interest to almost everyone, it  
really
 can be a way to build relationships. 
Firstly
,  
countries
 organize  
different
 types of competitions among themselves to prove that one is  
better
 than the other. Global sporting  
events
 can unite  
people
 regardless of their views on politics or religion. And it  
helps
 to  
keep
 the world in peace till  
today
. International  
sport
 can  
keep
 it in peace for  
many
 years,  
but
 we  
have to
 work on it.  
For example
, the Olympic Games,  
countries
 from around the world are competing and trying to prove that they are  
better
.  
But
 there are exceptions to this, we all  
love
 to win and a few who know how to lose,  
so
 such competitions can complicate relations between countries. 
Secondly
, we all have a touch of nationalism when we want to  
show
 others that we and our  
country
 are  
better
,  
but
 war is not the best way, and  
sport
  helps
 us again.  
Many
 wars based on nationalist beliefs could not be  
stopped
 thanks to  
sports
,  
but
 to dilute the situation between the powers with  
some
 kind of  
sports
 competition would be quite real.  
For example
, I believe that in our  
country
, there is  
some
 confrontation between the east and the west of  
Ukraine and
 they solve their conflicts in  
sport
, Ukrainian football, basketball or hockey teams  
meet
 to decide who is  
better
, this is the right way to resolve such conflicts.
In the  
end
, I would say that  
sport
 unites  
people
 from  
different
  countries
 and the  
countries
 themselves,  
but
 you should not base politics  
only
 on it,  
because
  sometimes
 it can  
only
 complicate relations. International  
sport
 is  
very
 useful for relationship to the Earth.