President Trump has shown great skill in dealing with Iran and North Korea, argues Conrad Black of National Review. With the former of the two, undoing the Iran nuclear deal was the right choice. The US can now use its leverage to push the regime towards more concessions and definitive nuclear disarmament. Sanctions and the possibility of war would be very hard to stomach for Iran. A tough approach strongly contributed in bringing North Korea to the table, which will likely agree to concessions. Both countries have threatened others with nuclear weapons. Trump was right to apply pressure on them to ensure they don’t act out their threats.