You can donate directly to the defense and reconstruction of Ukraine:

https://u24.gov.ua/

Donations towards medical aid or rebuilding (but not defense and demining) appear to be tax deductible (EIN 87-2080907).

For every boost this post gets, I'll add a dollar to my next donation.

UNITED24 — The initiative of the President of Ukraine

The official fundraising platform for collecting donations to support Ukraine

u24.gov.ua
@theruss I believe it is tax deductible for US taxpayers. I got a receipt for my donation that listed EIN 87-2080907, which received a determination letter from the IRS as a 501(c)(3) charity.
@DaveMWilburn Good info, thanks. Did you make it directly through U24.ua.gov or via some other means?
@theruss I went straight to the URL you posted.

@DaveMWilburn I figured it out!

Donations to "Defence and Demining" don't send a receipt or show a tax ID, but the "Medical Aid" category shows a tax ID and I'm betting it'll send a receipt.

@DaveMWilburn

Tagging @peterwbackes to see this.