British Foreign Secretary Boris Johnson takes part in an international news conference on the future of Syria and the region, in Brussels, Belgium, April 5, 2017. REUTERS/Yves Herman

SARAJEVO (Reuters) - British Foreign Secretary Boris Johnson said on Thursday a United Nations resolution should be passed before any unilateral action was taken in Syria.

“It is very important to try first to get out a U.N. resolution,” Johnson told reporters in Sarajevo.

“I cannot understand how anybody on U.N. security council could fail to sign up to a motion condemning the actions of the regime that is almost certainly responsible for that crime,” Johnson told reporters.