Ukrainian President Volodymyr Zelensky urged world powers to help stop Russia's war in his country in a speech to the United Nations on Wednesday, warning of a dangerous arms race that he said the fighting was helping unleash. He called for global rules to curb the use of artificial intelligence in weapons while describing breakneck innovation in the military use of drones. He also accused Russian President Vladimir Putin of seeking to expand his war beyond Ukraine. "Stopping Russia now is cheaper than wondering who will be the first to create a simple drone carrying a nuclear warhead," he told the 193-member United Nations General Assembly. His comments came a day after he met US President Donald Trump at the...