LOL,that is just your wild imagination. The truth here is russian ground force have never tried to attack any big ukrainian city,and that is the only truth here except your imagination and bullshlt western propaganda fake news.The reason Russians are stalling is because they got their assessments on Ukraine so wrong ;
Putin bet on a clean and swift operation,the quick surrender of Ukraine and eastern Ukraine rallying on the Russian cause,towns falling one by one,welcoming Russian troops as liberators... none of that happened. And Ukraine didn't even declare general mobilization when Russians attacked....
Putin hoped for a quick takeover of Kyiv to decapitate the Ukrainian government to put a puppet in power... none of that happened.