An international deal aimed at preventing Iran from developing nuclear weapons will in the long run eliminate any need for a missile defense system in Europe, Russia’s foreign minister said Wednesday.

American officials have said the missile defenses they want to install in Europe will protect NATO allies and counter any threat from Iran. Russia has long opposed the plan, and sees the system as a threat to the viability of Russia’s own nuclear arsenal as a deterrent.

In Geneva last month, leading world powers reached a deal with Iran to ensure that its nuclear program remains peaceful. […]