after witnessing the atrocities in bucha firsthand, president zelenskyy said diplomacy and sanctions were no longer enough. >> we need heavy artillery, armed vehicles, air defense systems and combat aircraft. anything to repel russian forces and stop there were crimes. >> the united states and europe have praised president zelenskyy, but nato leaders have said repeatedly they won't intervene and won't impose a no-fly zone to help ukrainians deliver a knockout blow to russia. and why? because vladimir putin has 6000 nuclear weapons. >> putin is showing to the world is that if you have a new look, and you can prove it, and wave it around, you can do whatever you want. >> and our way, this family dreams of home. they want to one day return to mariupol and rebuild. [speaking foreign language] >> i hope that the worst finished at we can come back for our country, for burial pull. we build the city again. i really hope so. >> there isn't much to return to in mariupol. the city has been raised to the ground. how many more cities and depth like this? how long this war lasts depends