I can't tell if you are memeing or not, usually I can with you, but anyways:
100% taking cities require a lot of man power, which Russia has, especially over ukraine. There is definitely propoganda going around, like I doubt the Ghost of Kyiev actually took down 6 Russian jets in the first 24 hours of the invasion. You are right they are losing battles, and based on those battles is how you determine who is winning the war, just like WW2. German was winning several battles, forcing their way to Western Europe, winning the war. Then they started losing the battles, which eventually led to them losing the war.
I highly doubt World War 3 will start, if so it will only take place in Europe. Russia knows that poking the bear (NATO) will not end well for them. Technically you could not consider Russia a super power anymore. They have numbers in their forces, however their technology is not nearly as sophisticated as the US and their allies. The trick that Russia always pulls are nukes, its like a trump card, however there are several counter defenses against things such as nukes.
When it comes down to it, even if World War 3 started, and we were involved in it, an invasion on US territory is very slim to none. The only way to get into the US is overseas, and then either a beaching on our coasts, or an invasion from our north/south borders. We have the strongest Navy by far, including 8+ aircraft carrier fleets, which Im fairly certain 8 of them are actually Super carriers. Anyways, they would have to pass our Navy, as well as our airforce to even reach the US.
Russia definitely has the ability to take Ukraine, never said it wasn't possible. however, so far their attempts have failed and are costing them a lot. Russia makes most of its money based on their oil/natural gas. They provide oil/natural gases to A LOT of western European countries, however with sanctions and other penalties towards Russia, they are not gonna last forever. They rely on Western Europe to support themselves. Without oil/gas Russia isn't valued for much, shit more than half of their country is uninhabitable. This is also most likely the reason they even invaded Ukraine, back in I believe 2012 it was discovered there are 2 large deposits of oil on Ukrainian soil and a mass amount of oil to the east of the Crimean Peninsula in the black sea/Chorne sea. If Ukraine tapped those and started providing the west with it instead of Russia, Russia's economy would plummet.