Re: "Firm response to Putin now could avert worse later" (editorial, 6-24).
Although Russian President Vladimir Putin is not to be trusted, it is understandable that he and Russia experience threat due to the ever eastward expansion of NATO.
When the Berlin Wall came down in 1989, West Germany's foreign minister assured Mikhail Gorbachev that NATO would not take advantage and expand ever more eastward. This assurance gave Gorbachev the ability to reunify Germany and delete the Iron Curtain.
Since then, NATO has come ever closer to the Russian borders and its security zone, with the result of Putin pushing back. How would the U.S. react if, for example, China started encroaching on the Philippines or some of the areas which we consider our security zones ?