美国官员说，现在关键是乌军兵员不足，而乌克兰新征的士兵不足以补充乌军在战场上伤亡的士兵。（原文）

Ukraine should consider lowering the age of military service for its soldiers to 18 from 25, a senior U.S. administration official said on Wednesday, putting pressure on Kyiv to bolster its fighting forces in the country's war with Russia.

Speaking to reporters, the official said Ukraine was not mobilizing or training enough new soldiers to replace those lost on the battlefield.

"The need right now is manpower," he said.