Answer:
unilateralism
Step-by-step explanation:
Unilateralism mode of government is a style of government that favors taking a decision or policy concerning its foreign affairs alone without consulting other foreign nations or allies.
In other words, it involves a situation in which a country doesn't involve an International institution in its foreign activities or affairs. It is the opposite of Multilateralism.
Hence, in this case, the correct answer is UNILATERALISM.