Earlier quoted context omitted.
Japan has ongoing territorial disputes with Russia. https://en.wikipedia.org/wiki/Kuril_Islands_dispute It's probably in their best interest not to signal "it's fine to forcibly annex someone else's lands".
Given this specific example is about islands controlled by Russia, but wanted by Japan, it sounds like Crimea is good precedent for Japan?
After USA pressured Japan to sanction Russia and send military support to Ukraine, all talks about Kurils were terminated.