UK Prime Minister Boris Johnson said states have a “right to take action in self defense” following a US drone strike which killed top Iranian military leader Qasem Soleimani in Baghdad on Friday. 

“States have a right to take action, such as this, in self defense,” a Downing Street spokesman said, adding that the UK and the US have a “very strong relationship on security” matters.

According to Downing Street, Johnson was in touch with senior officials on Friday and over the weekend following the strike, and spoke with Iraqi Prime Minister Adil Abdul Mahdi today to discuss the de-escalation of tensions in the region. 

“The leaders discussed the need to de-escalate tensions in the region following the death of Qasem Soleimani and agreed to work together to find a diplomatic way forward,” Downing Street said in a statement. 

The call between the two leaders follows Iran’s announcement that it will begin to enrich Uranium beyond the limitations set out by the the Joint Comprehensive Plan of Action agreement — a development which the Prime Minister has called “concerning,” Downing Street said. 

“The nuclear deal is reciprocal and we are urgently speaking to parties about the next steps,” the statement added.