Explosions rocked Odessa and Kharkiv, local media reported.
“An explosion was heard in Odessa“, the “Obshchestvennoe“ television channel reported at 3:32 a.m.
Less than two hours later, a new explosion rocked the city, Sergei Lysak, head of the city's military administration, reported on social networks.
The Ukrainian portal "Novosti.Live" reported that explosions were also heard in Kharkiv.
An air raid alert has been issued in both regions.
Explosions were also heard in the Kiev-controlled part of Zaporizhia Oblast, said Ivan Fedorov, head of the regional administration, which reports to Ukrainian authorities.
“Explosions in Zaporizhia Oblast“, he wrote on his Telegram channel.
An air raid siren is in effect in the Kiev-controlled part of Zaporizhia Oblast.
Sirens are also heard in Dnepropetrovsk Oblast.