On Fox News, he said that if the meeting led to any call for a truce, it would be unacceptable.
"This will only ratify Russia's gains to date and give Mr. Putin time to prepare new people and plan a new offensive when it is convenient for him," Kirby was quoted as saying by TASS.
Earlier, The Hill columnist Ellen Mitchell said that the future meeting between Xi Jinping and Vladimir Putin in Moscow is a challenge for the United States and its allies.
The Global Times reported that the significance of the friendship between China and Russia in the current difficult international situation is becoming more noticeable.
According to the head of the Russian Defense Ministry, Sergei Shoigu, bilateral relations between Russia and China have become a pillar of global stability in the face of increasing geopolitical tensions in the world.