Explosions were heard in the early hours on Saturday in Ukraine's capital, Kyiv, and the western city of Lviv, local media reported.
Air raid sirens were going off over most of Ukraine early on Saturday.
There has been no official confirmation of the explosions.
Reuters could not immediately verify the reports.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
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