President Volodymyr Zelensky on Sunday said "missiles will speak for themselves," following reports that U.S. President Joe Biden has authorized Ukraine to conduct strikes deeper into Russian territory.

Not for the first time, Poland scrambled fighter jets as missiles headed for western Ukraine. And in the capital, Kyiv, fragments from intercepted missiles and drones fell in several places, but there were no reports of injuries.

With less than two months remaining in his term, US President Joe Biden has authorized Ukraine to use US long-range ATACMS missiles to strike deep inside Russia, crossing a "red line" that Russian President Vladimir Putin said could lead to direct war between Russia and NATO.