President Joe Biden called a United Nations Security Council meeting on Russia’s threat to Ukraine “a critical step in rallying the world to speak out in one voice,” elevating the push to heap diplomatic pressure on Moscow.

“We made clear to the international community the full implications of that threat — not just for Ukraine, but for core tenets of the UN Charter and the modern international order,” Biden said in a statement on Monday. “The world must be clear-eyed about the actions Russia is threatening and ready to respond to the risks those actions present to all of us.”