call up 500,000 men has been drastically reduced. Some analysts believe Ukraine would have trouble fielding an additional 50,000.
Calling up an additional 500,000 men, results in approx. $2-3B in additional monthly expenditures for the Ukrainian budget.
That is, potentially $36B a year. Perhaps more, since the UA government has been increasing bonuses for frontline duty.
The current aid packages are enough to fund Ukraine's budget for a year or more, but if mobilization kicked off on that scale - Ukraine would urgently need more funds.
Zelensky and his hapless chief commander have come up with some funny excuses for why they no longer want to raise 500K men. Their main argument now, is that following some magical "audit", they discovered hundreds of thousands of soldiers that have never been to the front.
The real problems, of course, are that:
1) No same person in Ukraine wants to join the army. It is a one way ticket, and tantamount to suicide - since there is still no law regarding demobilization.
2) They have alienated the entirety of the diaspora and refugees through their recent draconian laws that make those people second class citizens unless they enlist.
3) They have no money to pay these people
4) They do not have enough kit to equip these people with.
Even Russia could not easily stand up 500,000 men. America would struggle. Probably China would find it difficult.
How on Earth is Ukraine supposed to do it, with a $60B package supposed to last years?