Because Trump wants to end the war to get a Nobel peace prize and Russia can plausibly unilaterally deliver that. What that means for Ukraine or Europe or frankly American strategic interests is not being considered because MAGA voters aren't exactly your internationally literate types. (Which is fine.)
> US should be laughing at Russia's puny attempts to breach their invincible defenses
Nobody is ever laughing in war. But to the extent we've had martial hilarity in the last few years, it's been in Russia mangling their elite forces in the failed sacking of Kyiv; Moscow almost getting bulldozed by Prighozin, a disaster stopped only because Belarus bailed Putin out; and potentially Indian warplanes' confused radio calls while Pakistan's integrated air defences potted them.