A few weeks? No way. Putin is all about being macho and the image he projects. Russia will drag it out and make everyone pay until they can't anymore. See Afghanistan. Russia had a lot of resources. They are a long way form that. They have been sending old equipment into Ukraine. They have been holding back most 4th and 5th gen fighter jets and other equipment. Maybe because he has plans for those, maybe because he doesn't think this war requires the risk. But he had a lot more power to bring. Russia won't be broken in a few weeks.