national isolationism; isolation policy
Refers to a policy of national seclusion, especially associated with Japan's historical sakoku period, but also used for modern isolationist stances.
During the Edo period, Japan adopted a policy of national isolation.
The politician was criticized for his isolationist remarks.
鎖国 refers to the state or act of national isolation itself, while 鎖国主義 emphasizes the ideology or policy stance.
Compound of 鎖国 (sakoku, 'national isolation') + 主義 (shugi, 'principle, -ism').