When the US bombed Iran’s nuclear sites last month, Washington may have inadvertently sent Pyongyang the clearest signal yet that relinquishing its nuclear arsenal could expose North Korea to the very attacks it aims to avoid.Political analysts say Washington’s hardline approach to Iran’s uranium enrichment has only cemented the North Korean leadership’s deep-seated conviction that nuclear weapons are the ultimate deterrent. Compounding this, as Pyongyang has forged closer strategic bonds with...