RIYADH: Saudi Arabias crown prince Mohammed bin Salman made a telephone call to British prime minister Boris Johnson. The crown prince and Johnson discussed the developments in Ukraine and the exerted efforts toward regional and international issues. They also discussed aspects of cooperation between the two countries and ways to develop them. Saudi aid agency KSrelief signed two cooperation agreements with the UN worth a total of $10 million to provide medical aid and housing assistance to Ukrainian refugees who have fled to neighboring countries, the Saudi Press Agency reported on Monday.