Military Historian Prof Victor Hanson Expounds on the War

Updates on the situation in Ukraine on the 9th day of the war. What is military historian Prof. Victor Hanson's answer to the following crucial questions?
How does he see the state of the warfare in Ukraine right now?
Why did Putin decide to invade Ukraine now?
The role of US energy policy in Putin's decision
The relationship between CCP & Putin in this decision
How does this war play into the "Great Reset"