This NPR News Now episode covers a deadly Russian drone and missile attack on Kyiv, prompting a day of mourning in Ukraine. Other stories include Iran warning oil tankers in the Strait of Hormuz, FAA suspending flights near Washington D.C. for the nation's 250th birthday, and new research affirming mRNA vaccine safety despite political criticism. The broadcast also reports on a self-immolation protest at the UN, a tragic truck crash involving monks in Thailand, and the discovery of a rare Declaration of Independence copy in the UK.