Kyiv, Ukraine CNN  —  It is a very specific and high-profile warning, so you would expect the information behind it to have been quite precise. The US Embassy in Kyiv has not closed since it relocated during the opening months of Russia’s invasion of Ukraine in 2022. But on Wednesday, it announced a one-day closure, citing “specific information of a potential significant air attack.” Kyiv endures air attacks on an almost nightly basis – but the US step suggested a fear of being potentially