The US helped Ukraine plan its counteroffensive against Russia, sources told CNN.
This reportedly included encouraging Ukraine to limit the operation's scope so it wouldn't get overwhelmed.
It also ran through multiple scenarios with Ukraine to see how many troops were needed, CNN reported.
The US helped Ukraine plan its long-awaited counteroffensive by advising it against stretching itself too thin when fighting back against Russia, CNN reported.
The US advised Ukraine to limit the scope of operations both in terms of its aims and the amount of land to cover so it could avoid overextending itself and getting stuck, Western officials, including from the US, and Ukrainian sources told CNN.
Ukraine said on Monday that it had begun its counteroffensive after weeks of teasing one, and after weeks of stalemate with little progress from either side. Ukraine said the counteroffensive had started in Kherson and some other southern areas.
CNN's report said Ukraine initially wanted to do a bigger operation, but later decided to focus on the Kherson region. The city of Kherson was the first major city that Russia took in its invasion.
The US also ran analytical exercises with Ukraine so Ukraine could see how big a troop commitment it would need depending the plan it chose, CNN reported.
The US Department of Defense did not immediately respond to Insider's request for comment.
Brig. Gen. Pat Ryder, a Pentagon spokesperson, told CNN: "The United States has routine military-to-military dialogue at multiple levels with Ukraine. We will not comment on the specifics of those engagements."
"Generally speaking, we provide the Ukrainians with information to help them better understand the threats they face and defend their country against Russian aggression.
"Ultimately, the Ukrainians are making the final decisions for their operations."
The counteroffensive appears to have worked in Ukraine's favor so far.
The UK's Ministry of Defence said on Wednesday that Ukrainian forces had "pushed the front line back some distance in places, exploiting relatively thinly held Russian defenses."
Heavy fighting has been reported in Kherson since Monday.
Ukrainian President Volodymyr Zelenskyy and other officials have repeatedly vowed that Ukraine will take back all of its land from Russia, including Crimea, which Russia annexed in 2014.
But, Oleksiy Arestovych, a Zelenskyy advisor, said on Monday said the counteroffensive is unlikely to have quick results by design.
"This is a planned slow operation to grind the enemy, saving the lives of our military and civilians," he said.
The UK's defense ministry said Russia will likely respond to Ukraine by trying to plug the gaps in its defenses by bringing in mobile units.
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