"He [Milley] said that Ukraine is likely unable to return all its territories within the 1991 borders in foreseeable future. That is a step forward toward understanding the reality on the ground," Lavrov said.
The top Russian diplomat also called Western military supplies to Ukraine an "unacceptable escalation," adding that this understanding exists even in the West.
"Of course, it is unacceptable escalation. I think that there are still people in the West who realize this, but it is Washington, London and their satellites inside the European Union that are dictating everything," Lavrov added.
Earlier in the week, Milley said that in the short term Kiev is likely unable to achieve its strategic objective, which is to return control of all the territory it has lost to Russia.