According to British defense experts, it is unclear whether Russia’s front troops have “sufficient reserves or enough morale” to withstand another joint attack in eastern Ukraine.
The Defense Ministry said Moscow had built a defense line between the Oskil River and the town of Svatove.
Any substantial loss of territory here would “unequivocally undermine Vladimir Putin’s strategy for the conflict,” the experts say.
Russian President Vladimir Putin warned on Friday that Ukraine risks provoking “more serious” actions from Moscow with its sweeping counter-offensive, claiming that “we have reacted with restraint so far”.
Mr Putin pledged to continue his “special military operation” in Ukraine during his address to reporters after attending a meeting of Asian world leaders, the Shanghai Cooperation Organization, in Uzbekistan.
He said the “liberation” of the entire eastern Donbas region of Ukraine remained Russia’s main military goal and that he has no intention of giving up the fight.
Indian Prime Minister Narendra Modi first publicly reprimanded Putin and the Russian leader admitted there were also concerns about the situation in Beijing.