Ukrainian President Volodymyr Zelenskyy appeared somber and, at times, angry in a blistering address to the U.N. General Assembly on Tuesday, as he sought to shore up support for his country’s war effort and demand that Russia be punished for the invasion.

Wearing his trademark green fatigues at the dais at the front of the hall, Zelenskyy furrowed his brow as he called for other countries to recognize that Russia was not just a threat to Ukraine — but to the entire world. He appealed for other countries to help hold the line against Moscow, as “mass destruction is gaining momentum.”

“While Russia is pushing the world to the final war, Ukraine is doing everything to ensure that after Russian aggression, no one will dare to attack any nation,” Zelenskyy said.