One reporter that is stationed in Kiev said on Bidens visit was the first time the sirens had blasted in a week and it was just for the cameras.
CNN Reporter Alex Marquardt Says No Air Sirens Or Explosions Went Off In Kyiv Until Biden Showed Up
I suspect in the near future we can expect the reporter to recant, possibly reading a prepared statement with lawyers standing off camera (we're not quite at the point where it requires men with guns pointed at the person recanting).