Their plan was quite obvious roll in from north take capital, and control major supply lines routes leading to south and east fronts. Then install puppet govern

Their plan was quite obvious roll in from north take capital, and control major supply lines routes leading to south and east fronts. Then install puppet government and make them give away claims to crimea and eastern provinces. There is a large newly discovered gas field there that putin surely would love to claim for russia. They clearly failed with north invasion and disruption of supply lines. They are clearly retreating and the military leadership is either dead by Ukrainians or let go by kremlin. You don't fire your general(s) for achieving goals. Russia is amassing troops on south and east, as probably last attempt to take and hold ground. But that will be much harder now (no political support of puppet government, plus failed to disrupt logistical channels). They have less then a month to do something substantial to claim war goals for their Victory Day parade.