The US is supplying: -the long range weapons -the training -the Sat imaging for targeting -the grunt Ukrainians are doing as told.
Now lets imagine that this was happening in our area.
That we invaded PNG (as we did East Timor) but for a longer sting ...lets say 28 months (whatever the justification)
Now lets imagine that China was : -supplying the PNG army with long range missiles capable of hitting Brisbane -that China was providing PNG with the training -that China was providing targeting via its Sat technology -and that the PNG army was doing the grunt work.
Would we think that we were being attacked/counterattacked by PNG or China..mate?