Correct

盟约

/ méngyuē / 
Strokes

Definition

contract of alliance/oath or treaty between allies

Example

As a Noun

oath of alliance; treaty of alliance

1
Lǚxíng
履行
méngyuē
盟约

enforce the treaty of alliance

2
Fèichú
废除
méngyuē
盟约

abrogate the oath of alliance

3
Dìnglì
订立
méngyuē
盟约

sign the treaty of alliance