World Brief: Yemen’s Houthis declare a naval blockade on Saudi Arabia, Andy Burnham becomes the United Kingdom’s new prime minister, and Ukraine tries to quell domestic political u

World Brief: Yemen’s Houthis declare a naval blockade on Saudi Arabia, Andy Burnham becomes the United Kingdom’s new prime minister, and Ukraine tries to quell domestic political unrest. Link Houthis Declare a Naval Blockade on Saudi Arabia The move could increase pressure on already-strained global energy markets.