News Summary at 2:13 p.m. EDT

Iran’s president defended a U.S.-Iran memorandum as the best route to end a stalled conflict, but Iran’s new security chief took a tougher tone on Sunday, warning neighboring countries against joining new U.S. sanctions and threatening retaliation. The U.S. Treasury secretary is expected to announce additional economic measures against Tehran on Monday. Pakistan’s army chief also plans to travel to Tehran as mediators work to revive talks. Meanwhile, in Gaza, health workers said an Israeli strike killed a 4-year-old child, and violence continued in the occupied West Bank. The developments underline how diplomacy and escalation are moving in parallel.