North Korea has updated its constitution to require a retaliatory nuclear strike if leader Kim Jong Un is assassinated, according to a report. The Telegraph reported the change comes amid heightened global tensions following the killing of Iran’s Supreme Leader Ali Khamenei  and other officials during a recent conflict. Khamenei was killed in an Israeli strike in Tehran as part of a coordinated US-Israeli military operation earlier this year, Fox News Digital previously reported. The constitutional revision was approved during a session of North Korea’s Supreme People’s Assembly, which opened March 22 in Pyongyang, the outlet said. South Korea’s National Intelligence Service (NIS) briefed senior government officials this week on the update, according to the report. The revised policy outlines procedures for retaliatory action if North Korea’s leadership is incapacitated or killed.…