TOKYO—Japan announced Friday that it will raise the coronavirus alert level in Tokyo to allow tougher measures to curb the rapid spread of a more contagious variant ahead of the Summer Olympics. The raised status announced by Prime Minister Yoshihide Suga will allow Tokyo’s governor to mandate shorter opening hours for bars and restaurants, along with punishments for violators and compensation for those who comply. The measures are to begin Monday and continue through May 11. Many of Tokyo’s cases have been linked to nightlife and dining, though they have recently spread to offices, elderly care facilities and schools, experts say. Suga also raised the alert level for Kyoto in western Japan and the southern island prefecture of Okinawa, where cases have surged in recent weeks. The new status there is to continue through May 5, the end of Japan’s “Golden Week” holidays, to discourage traveling. “We will do everything …