A North Atlantic Treaty Organization (NATO) official said that there are indications that the long-awaited Ukrainian counterattack against Russia has begun.
Speaking to CNN, the official said that a "significant increase in fighting" had been observed in the east of the country over the past 48 hours.
According to the official and another official in European military intelligence, after the initial attacks, also known as "formation" operations, which took place for at least two weeks, Ukrainian forces began in the past days testing Russian positions with artillery strikes and ground attacks to find the weakest areas that could be penetrated.
The officials added that the collapse of a dam in the Russian-occupied Kherson region, which triggered a wave of evacuations on Tuesday as flood waters gushed out from the Nova Kakhovka hydroelectric power station, may complicate some of Ukraine's plans.