Not really falling for propaganda to be skeptical of things in war. Should be some footage of DPRK troops in Ukraine by now, certainly won't trust Ukrainian announcements.
Not sure the DPRK troops are the sole reason, we don't know the full calculation the US is doing, people assume Ukraine should be above all and hate on them though, heh.
In terms of missiles, was following some Ukrainians on social media estimating they have 20 left and need to use 6 per target (I guess Russian AD works somewhat).