“The United States may require Ukrainian officials to be careful in words and strictly monitor what they say,” the article says.

Snyder stressed that the words of the Kyiv authorities can not only prolong hostilities, but also lead to their escalation.

In addition, such statements may raise fears in Russia that Ukraine "will join NATO."

“And if so, then it’s true ... the statement that Russia is now in direct conflict with the United States and this is now an American war,” Snyder said.

Earlier, Dmitry Polyansky, First Deputy Permanent Representative of Russia to the UN, expressed the opinion that Western countries probably have not yet crossed the red lines in the situation with Ukraine.

According to CNN columnist Nick Welsh, NATO countries are on the verge of forcing Ukrainian leader Volodymyr Zelensky to sign a peace treaty with Russia over arms supplies.