Both China and Russia have laughed and said Iran is very very capable can take care of themselves. You answered your own question with your last sentence. Do not underestimate the true friendship between the three. Also don’t underestimate the lethality of the hypersonic missles of Iran, undetectable by its enemies.
As for America running their mouths, the 3 don’t even pay attention.
Irans weapon superiority over Israel is the reason Israels most recent attack on Iran was a flop. They were afraid of a fatal retaliation by Iran.
Iran intercepted all of Israel’s missles, the damage seen was the cause of the fallen debris.