This is how important the relationship is between the Yen and Oil- since the outbreak of the war, USDJPY and the price of WTI Crude Futures has been moving essentially in lockstep.

Japan imports 97% of its crude oil, and has virtually no energy independence since Fukushima incident in 2011. After that reactor leaked radioactive waste, all nuclear reactors across the country were shut down as a safety measure.

In order to understand Japan and global capital- you need to grasp energy as well.