Logistics is at the heart of war.
Any discussion of logistics is a good one. Logistics depend on basing, either air or sea. it's a fairly good discussion. Sea or river transport is 10x preferable to rail and rail is 10x preferable to trucks. Air is fast but very very expensive.
You need to stage fuel, war stocks, ability to conduct and sustain maintenance, room to build up troops and their equipment, and the ability to control that. Bases have to be close but not too close, must be defensible, all-weather, and have support populations nearby, good infrastructure, and a fairly friendly population.
Geography and terrain drive logistics.
The Pacific is vast. It has few natural resources. Basing takes time and money. We had to abandon Guam and Wake and the Philippines due to logistics in WWII - the Japanese had internal lines of control once they gained Singapore. We had to rebuild our bases and sea transport. Japan ran out of logistics at Guadalcanal where we could resupply faster than they could build up. To contest China we will have to do the same thing.
The Ukraine sits on the Black Sea. Major rail corridors cross it. Rivers run deep into the Ukraine from the Black Sea. It connects to Europe via the Dniester. Then connects to Russia via the Dniepr. The watershed between those two rivers is key ground.
He is right to talk about bases in Poland. Big bases like we built in Saudi Arabia.