Ukraine is attacking the harbor of Sebastopol in order to interdict its use for supplying Russian forces occupying Southern Ukraine.
The US (and half the world too) are supplying aid to Ukraine in order to repel this Russian aggression. This aid is due to Ukraine according to various international guarantees given Ukraine, plus the prudential cause of discouraging this sort of international aggression.
The “international aggression” is advancing an outdated but ravenous military alliance up to the doorstep of an adversary in order to keep the honey pots flowing for globalist elites, terrified their revenue would be halted by the sudden collapse of their adversary.