Because in Ukraine if we intervene directly the US will be at war with Russia. Instead we are supplying weapons and intel.
To be more specific, since 2025, selling weapons.
"And everything we send over to Ukraine is sent through NATO and they pay us in full." - Trump
https://www.pbs.org/newshour/politics/read-trumps-full-2026-...
https://app.23degrees.io/embed/j4luMuv8fnpO2frL-bar-grouped-...
Which the US actively funds…so after a $66 billion advance now the costs are being shared by other vested countries.