路透社：美国告诉乌克兰美国资源不是无限的。

https://www.reuters.com/world/europe/ukraine-war-enters-second-year-can-us-support-last-2023-02-22/

One U.S. official, who requested anonymity to speak candidly about U.S. support for the war, said the administration has told the Ukrainian government that U.S. resources are not infinite.

"Everybody understands that this (war) has to end at some point. And we all would like to see it end sooner rather than later," the official said.