US President Donald Trump has excoriated Ukraine's leader after the country launched one of its biggest drone attacks on Russia this year, hitting a key oil terminal in defiance of his demand it stop hitting Russian energy infrastructure. There have been growing tensions between Ukraine and the US in recent days, prompting fears in Kyiv it could lose essential support as it approaches another winter under relentless Russian attack. Trump on Friday invoked a waiver exempting Russia from sweeping economic penalties mandated by the US Congress. Ukrainian President Volodymyr Zelensky later told NBC News' "Meet the Press" the US siding with Russia would be a "historic mistake."