If now Ukraine, with the help of friends and helpers from all over the world
You may not like to hear this but the reason why Ukraine is losing more ground every day is because you think these are Ukraine's "friends" but in reality they are Ukraine's biggest enemies. From US that is fighting Russia to the last Ukrainian to EU that is funding the war against Ukraine!
This is exactly why there isn't going to be any "world" war because of Ukraine.
Era of direct military confrontation is over, because it is too costly (in terms of manpower and finances). Now all the major world powers are interested in proxy wars, which doesn't cost them a lot of lives and money.