The UN’s two major bodies — the 193-nation General Assembly and the more powerful 15-member Security Council — will hold separate meetings Monday on Russia’s invasion of Ukraine, a reflection of widespread international demands for an immediate cease-fire and escalating concern for the plight of millions of Ukrainians caught up in the war.

The Security Council gave a green light Sunday for the first emergency session of the General Assembly in decades. It will give all UN members an opportunity to speak about the war Monday and vote on a resolution later in the week that the US Ambassador Linda Thomas-Greenfield said would “hold Russia to account for its indefensible actions and for its violations of the UN Charter.”

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French Ambassador Nicolas De Riviere announced that the Security Council will hold a meeting Monday afternoon on the humanitarian impact of Russia’s invasion, a session sought by French President Emmanuel Macron to ensure the delivery of aid to growing numbers of those in need in Ukraine.

Both meetings follow Russia’s veto Friday of a Security Council resolution demanding that Moscow immediately stop its attack on Ukraine and withdraw all troops. The vote was 11-1, with China, India and the United Arab Emirates abstaining.

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De Riviere said France and Mexico will propose a draft resolution “to demand the end of hostilities, protection of civilians, and safe and unhindered humanitarian access to meet the urgent needs of the population.” It said it will probably be put to a vote Tuesday.

Sunday’s vote in the Security Council on a resolution co-sponsored by the United States and Albania to authorise the General Assembly session was exactly the same as on Friday — 11-1 and three abstentions. But because council approval for such a session is considered a procedural vote there are no vetoes and the resolution got more than the minimum nine “yes” votes needed for approval.

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Last week, Ukraine asked for a special session of the General Assembly to be held under the so-called “Uniting for Peace” resolution, initiated by the United States and adopted in November 1950 to circumvent vetoes by the Soviet Union during the 1950-53 Korean War. That resolution gives the General Assembly the power to call an emergency session to consider matters of international peace and security when the Security Council is unable to act because of the lack of unanimity among its five veto-wielding permanent members — the United States, Russia, China, Britain and France.

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The US ambassador told the council after Sunday’s vote that members had taken an important step forward in holding Russia accountable for its “unjustifiable assault, fabricated out of lies and the rewriting of history,” and now all nations can be heard in the General Assembly.