Why is Biden sending $125 million of tax payer money to Ukraine?

I'm more interested in how much money the Ukraine sent to Biden, and why.

Probably to help Ukraine keep pro-Russian insurgents from taking over parts of their country, like we've been doing for almost a decade.

It's called military aid.
The package funded by the Foreign Military Financing program, which gives money to other nations so they can procure American-made defense systems. The package comes with two Mark VI patrol boats produced by SAFE Boats International, bringing Ukraine’s fleet up to eight of the vessels.The package also includes “capabilities to enhance the lethality, command and control, and situational awareness of Ukraine’s forces through the provision of additional counter-artillery radars and tactical equipment; continued support for a satellite imagery and analysis capability; and equipment to support military medical treatment and combat evacuation procedures,” per a Pentagon statement.

That is less than Trump charged the Taxpayer to play Golf on his own property.
Why are you so worried about government spending now?

If Ukraine had a story to tell, they would have told Trump when he tried to extort them.

Why hasn't your cult leader declared his taxes ken? You suffer from illusory truth effect. And the dime ain’t dropping that he made America a laughing stock for allowing a deluded blatant liar to remain in the WH for so long, when he should have been sectioned. I hope somebody puts your ludicrous Second amendment to good use and 'do a Kennedy' on the pond life. “Good riddance to bad rubbish”.

so they can fire the ones in charge