The US Embassy in Kyiv issued a security alert on Saturday, 23 May, warning that it had received information about a 'potentially significant air attack' on Ukraine that could occur within the next 24 hours. The embassy urged US citizens in Ukraine to be ready to shelter immediately if Ukrainian authorities sound an air raid warning.
The warning came as President Volodymyr Zelenskyy said Ukrainian, US and European intelligence had detected signs that Russia may be preparing a broader strike, possibly involving the Oreshnik intermediate-range ballistic missile. Ukrainian officials warned that Kyiv could be among the possible targets.