Kremlin responds to claim Kyiv may be given nuclear weapons after huge drone attack - Ukraine’s military says Russia fired record number of drones for single attack in overnight blitz on most regions

LONDON -- The U.S. Embassy in Kyiv temporarily closed its doors on Wednesday out of "an abundance of caution," as it warned that a potentially "significant" air strike may be coming. "The U.S. Embassy recommends U.S. citizens be prepared to immediately shelter in the event an air alert is announced," the embassy said in an update.