How do you differentiate "a Japanese government" from "the Japanese government"? See examples below.
Every time a Japanese government tries to do more to help its allies, or to contribute more to UN peacekeeping operations, pacifists cry "unconstitutional". https://www.economist.com/leaders/2017/10/28/time-for-japans-prime-minister-to-change-the-constitution
The government of a country means the group of people who govern the country, or it might refer to the entire organization itself made up of those people, usually politicians. In Japan, there is only one government governing the country, so I wonder how "a Japanese government" is possible.
Those who write or speak "a Japanese government" assume there are more than one government in Japan?