Estonia, a NATO member with a population of 1.3 million people and a standing army of about 6,000, would not stand a chance in a conventional war with Russia. But two armies fighting on an open field is not Estonia’s plan, and was not even before Donald J. Trump, the Republican presidential candidate, said European members of NATO should not count on American support unless they pay more alliance costs.

Since the Ukraine war, Estonia has stepped up training for members of the Estonian Defense League, teaching them how to become insurgents, right down to the making of improvised explosive devices, or I.E.D.s, the weapons that plagued the American military in Iraq and Afghanistan. Another response to tensions with Russia is the expansion of a program encouraging Estonians to keep firearms in their homes. Continue Reading.