After US president tests positive for COVID-19 secretary of state skips stops in South Korea, Mongolia

Parts of Gobi-Altai put under quarantine and related case reported in China; hundreds of cases and deaths reported each year

737 km section of Great Wall in Mongolian Steppe predates ferocious ruler; was built to control movements of nomadic peoples, boost Khitan-Liao Empire, Israeli hi-tech study shows

Though announcement of US national security adviser's departure came abruptly, the divide between him and Trump had been widening for months

Two Israeli medical officers participate in annual Khaan Quest exercise, working with soldiers from dozens of countries including some without diplomatic ties with Israel