I don't think this is the beginning of World War 3. China and Russia have not indicated any interest in helping their ally Iran. Russia is preoccupied with its war with Ukraine, while China is focusing on its economic war with the US. I guess they are avoiding direct war with the US. Maybe they might assist Iran indirectly. The outcome of this attack on Iran is just unpredictable.
i dont see china/russia as "ally's" in the same respect as how nato are allys of europe
i see china/russia as just trade partners of iran.. and unless wars cause chaos to their trade, they wont want to get involved in escalating wars
also to note:
the majority of countries want peace
andor atleast non nuclear wars.
iran also had stockpiles of 2000 ballistic missiles in spring.. have launched 520 of them so far (495 destructed mid-air, 25 hit isreali sites)
many countries know iran will have o come to a peace agreement at some point and it wont take long until the other <1500 ballistics are used up, leaving iran no other choice but come to peace
the sooner the better
if iran agreed to peace. they could actually have sanctions removed and start to economically prosper and help other trade partners
prosper.. so over all
, continuing the war helps no one