The United States has shut its embassy in Kyiv due to what it called the threat of a significant air attack, a day after Ukraine used US missiles to hit a target inside Russia in what the Kremlin has described as an escalation in the war. Later, after an air raid siren in the early afternoon jangled nerves in the capital, Ukraine’s military spy agency said Russia was trying to sow panic by circulating fake online messages about a massive looming missile and drone attack. “The enemy, unable to subdue Ukrainians by force, resorts to measures of intimidation and psychological pressure on society. We ask you to be vigilant and steadfast,” it said. A US government source said the embassy closure was “related to ongoing threats of air attacks”. The Italian and Greek