The territory occupied by Russian forces so far in the three-month-old invasion deserves “a worthy place in our Russian family,” a Kremlin official who toured the region said.
Targeting assistance is part of a classified effort by the Biden administration to provide real-time battlefield intelligence to Ukraine.
Its experience in a string of wars led to the conclusion that attacking civilian populations was not only acceptable but militarily sound.
The Russians intercepted a half-century-old Ukrainian naval vessel, then portrayed its actions as a provocative prelude to war.
Recent altercations in Europe, the Middle East and off the coast of Alaska have heightened tensions between the two rival powers.
The secretary of state’s acknowledgment came as a new detail surfaced about the intelligence that led to the C.I.A. assessment.