Better yet, work out a peace deal. We are broke.
Putin wants all the places that were in the USSR to be part of Russia.
He accuses Ukraine of being run by Nazis and Satanists who were making biological and nuclear weapons.
His most senior cleric actually said Ukraine was invaded to prevent gay parades in Orthodox Christian cities.
You think these loons are people you can negotiate with?
As for the reliability of a signed "peace deal" with Putin; Russia signed the Minsk Agreements and the Budapest Memorandum and subsequently wiped its ass with them.
Most of it is not current taxpayers' money, it is mostly money already spent on the USA's defense budget going back 20 years (for weapons and ammunition), just 3-5% of one year's budget. So that money would never reach US taxpayers even if it was not given to the Ukraine.
Apart from that, they don't even give them much actual cash, when they say $40 billion to Ukraine, what they mean is the original value of hardware, shells, missiles, bullets etc, very little of it is cash and that's mostly for humanitarian aid.
The missiles and shells sent to the Ukraine are typically approaching their "use by" dates too, so if not used up in US troop training exercises they would cost the US money to decommission.
Any money required for new ammunition manufacturing is actually being spent in the USA. It is all bought from American companies, so it is in effect stimulating the US economy in order to help Ukraine:
https://www.gmfus.org/news/us-military-support-ukraine-helping-put-american-industry-back-track