主要 しゅよう こく首脳 しゅのう会議 かいぎだったら
shuyō koku shunō kaigidattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 主要国首脳会議

1. If/when the summit of major countries…; If the summit of major countries were to…

Tara Conditional