It hasn't really changed much. Japan is in a tight spot. They need to cooperate with China but also not fold to China. China is mostly playing nice with Japan now (except for the occasional Tourette Syndrome outburst where they threaten to slaughter the entire population). They prefer to keep Japan on their side while they take on the western world, but as soon as they feel secure they would be calling Japan the enemy again.
In 25 years, I have seen Japan go from a place that loves China, and was looking forward to China's growth and to working with them to today - where China is Japan's biggest external threat.
In 15 years, XI has taken China from the cusp of glory to a very dark place that will not end well for anyone.