A deer runs close to the United States border with Canada near Havre, Montana, November 20, 2015. REUTERS/Lucy Nicholson
Donald Trump speaks to supporters at a campaign rally in Warren, Michigan, March 4, 2016. REUTERS/Carlos Barria
Donald Trump speaks at a campaign rally in Warren, Michigan, March 4, 2016. REUTERS/Carlos Barria
President Ronald Reagan and his wife Nancy kiss on their wedding anniversary in the White House, March 4 1985. REUTERS/Archive
Russian President Vladimir Putin listens to his Belarussian counterpart Alexander Lukashenko after a session of the Supreme State Council of Russia-Belarus Union State in Minsk, Belarus, February 25, 2016. REUTERS/Vasily Fedosenko
Militant Islamist fighters take part in a military parade along the streets of northern Raqqa province June 30, 2014. REUTERS/Stringer
Protestors hold a Polish national flag during a demonstration in Gdansk, Poland, February 28, 2016. REUTERS/Rafal Malko/Agencja Gazeta
The author is Reuters Breakingviews columnist. The opinions expressed are his own.
After the Soviet Union fell, NATO expanded. It also lost its main purpose: taking on that same Soviet Union.
Donald Trump at his caucus night rally in Des Moines, Iowa, February 1, 2016. REUTERS/Jim Bourg