* Cede territory early and retreat to defensible positions
* Let the enemy rush in and attack their stretched supply lines from the flanks
* Let the people know you are still fighting and not defeated
* Prepare the people to fight a long guerrilla war
* When the enemy spreads out to take too much territory too quickly, counter attack
I really don't understand the Russian military strategy. Their strategy of taking slivers of territory seemed to be working in Georgia and Crimea. They could have taken Donetsk and Luhansk with little effort and much less worldwide condemnation. Then started the bribery, disinfo, threats, "security" offer process all over again in the next territory.
But driving full force to Kyiv seems like exactly what a much weaker army would want you to do.