UNITED NATIONS — More than 200 global organizations urged the U.N. Security Council on Wednesday to impose an arms embargo on Myanmar, saying the time for statements has passed and immediate action is needed to help protect peaceful protesters against military rule and other opponents of the junta. A statement by the non-governmental organizations said the military “has demonstrated a callous disregard for human life” since their Feb. 1 coup, killing at least 769 people including 51 children as young as six years old and detaining several thousand activists, journalists, civil servants and politicians. Hundreds of others have disappeared, it said. “No government should sell a single bullet to the junta under these circumstances,” the NGOs said. “Imposing a global arms embargo on Myanmar is the minimum necessary step the Security Council should take in response to the military’s escalating violence.”