The war in Ukraine has reached the three-week mark.
Ukrainian President Volodymyr Zelenksy has called for more action against Russia in an emotional and defiant speach to US Congress.
Zelensky repeated his plea for a no-fly zone over Ukraine.
He appealed directly to US president Joe Biden, saying to be the leader of the world means be the leader of peace.
The war has now been ongoing for three weeks, and Zelensky says the invaders "have not suceeded".
Washington DC correspondent Simon Marks spoke to Guyon Espiner.
