What will happen if at the end Russia succeed in her conquest against Ukraine and take over the economy of Ukraine. That will extend the economic power of Russia no doubt and that will make Russia more powerful.
How will EU and NATO countries relate with Russia if that happens ?
Sanctions after sanctions, these will surely make Russia suffer even after they takeover kyiv. I think even if they could have Ukraine, the effect of international sanctions that they are facing will be massive in terms of economic drop. However, if they could find alternatives to these given sanctions added by the land and natural resources that Ukraine has, they could potentially be more powerful.
As long as China is not putting sanctions in Russia, their economy will not fall that much. They can feel some hindrances in doing transaction but Putin is prepared for this before he started the war. He might already have plans or alternatives to the sanctions that they are weighing as they still continue the fight. Russia can grow more powerful after war if they become successful in invading Ukraine but hopeful peace talk will happen already to stop it and to no longer put in danger all the innocent lives.