Yeah, CPTPP, or before that business and such still. International competition still will exists. The only way to satisfy those kinds of arguments is to be a loser or be a communists where everyone gets a fair piece regardless of quantity and quality of work put in. But even with that said, ASEAN in general seems quite comfortable with Japan. Definitely more so than China. If Japan is the worse kind of ally for Taiwan, better move to Taiwan and start campaigning there on the behalf of the CCP. What Russia gets for finding a settlement with Japan is obvious for those that aren't stuck to Russian style aggression.
It's interesting how you are mixing opposing statements in one post. If we believe in "International competition", then if investing in Russia is\will be profitable for foreign companies, then Japan companies will be among those investing in Russia anyway (completing with others for best position) - see for example Komatsu plant in Yaroslavl. No need to give away territory for that
New Komatsu repair facility in Magadan
And if Japan investments are dependent on territory deal, than all this talks about fair game and international competition are useless.