"The second phase of the war has started," the chief of staff to Ukraine's President Zelensky has said, APA reports citing BBC.
The remarks from Andriy Yermak echoed the warning given by Ukraine's top security official that Russia had launched its new offensive in the east on Monday morning.
Addressing fellow Ukrainians, Yermak wrote on the Telegram messaging app: "Believe in our army, it is very strong."