there is no way that america are going to send in the troops .. it seems that americans are not too keen to sign up

The current fiscal year is likely to be even worse. The shortfall forced the Army to cut its planned active-duty end strength from 476,000 to 466,000, but according to the War on The Rocks outlet, “Army officials project that active end strength could shrink by as much as 20,000 soldiers by September, down to 445,000.

https://www.thegatewaypundit.com/2024/04/us-army-air-force-call-retirees-return-active/

by contrast, it has been mentioned that patriotic russians are signing up at the rate of over a thousand a day