Political term referring to a policy of acting alone without consulting or coordinating with other nations. Often contrasted with multilateralism.
See also: 単独行動主義
That country's unilateralism was criticized by the international community.
A unilateralist foreign policy creates friction with allies.
Synonym listed; essentially the same meaning, but 単独行動主義 explicitly includes 'action' (行動), emphasizing acting alone.
Multilateralism; the opposite concept, where nations coordinate and act together.
Compound of 単独 (tandoku, 'alone, independent') + 主義 (shugi, 'principle, doctrine'). A straightforward Sino-Japanese political term.