Ukraine’s president has accused invading Russian forces of using white phosphorus, a controversial chemical substance that can cause severe and indiscriminate harm to civilians. “This morning, by the way, there were phosphorus bombs. Phosphorus Russian bombs. Adults were killed again and children were killed again,” President Volodymyr Zelensky said during a virtual address to NATO leaders on Thursday, as the military alliance held an emergency The Washington Post has not been able to independently verify reports of white phosphorous being used in Ukraine. Though the chemical is infamous due to the extreme damage it can cause, other incendiary weapons and...