As Russias plans are proceding very slow with lots of resistance i think Putin will get frustrated and start with the big attacks big bombs/ missiles even on residential areas,he doesnt want this going on for months and he knows Nato's hands are tied and if they do do something its WW3 so he will just flatten Ukraine ,the man is a maniac .
The slim hope is we get a lot more arms and weapons to the Ukraine and the sanctions start to hurt ,but i'm afraid all i can see atm is Ukraine being flattened and major casualties.( I pray for a miracle and this not to happen).
If it was army v army/ airforce v airforce the U.K alone could take the Russians out but its the Russian Nuclear weapons that are the problem.