South Korea and Ukraine top diplomats shore up ties as Saudi Arabia's foreign minister meets his Chinese counterpart Wang Yi for talks on trade, investment and regional security. Also on East Asia Tonight: Beijing says its military and coast guard held combat-readiness patrols around the disputed Scarborough Shoal in the South China Sea. 00:00 Headlines 01:42 Seoul, Kyiv discuss North Korean prisoners of war 02:49 Saudi foreign minister in China amid Middle East uncertainties 07:32 US, Iranian