朝鲜的武器测试达触及“红线”吗？

vigilance – n. the state of being watchful

advanced – adj. modern, highly developed

unilateral – adj. involving only one side or group

brink – n. the edge

sponsors – n. those who support a person, group or activity

sanctions – n. actions, usually to limit trade, that are meant to cause a country to obey international rules

grasp – v. to take hold of

maritime – adj. of or related to the sea