President Trump’s seizure of Venezuela’s oil and his on-again, off-again vows to acquire Greenland, by force if necessary, have underscored the new threat that Washington poses to nations’ sovereignty. 特朗普总统夺取委内瑞拉石油资源，还时断时续地宣称要吞并格陵兰岛，必要时不惜动用武力，他的种种言行凸显了华盛顿对各国主权构成的新威胁。…