Google considers country-code top-level domain names (ccTLDs; for example, .vn for Vietnam) to be a strong signal that a site is intended for users in a certain country.
Most ccTLDs will result in Google geotargeting the website.
If you want to geotarget users in different countries, using a ccTLD is like swimming upstream.
Like for .jp, Google assumes that that’s relevant to Japan and not as relevant to France or Finland.
It is true that Google allows webmaster to target ccTLDS to different countries generically.