Japanese authorities staged on Monday the first missile evacuation drill in the capital Tokyo in the event of a North Korean missile strike. Volunteers took cover in subway stations and other underground spaces, while small groups of protesters scuffled with police as they demonstrated against what they criticized as a war game that fanned public fear. While hope grows that North Korea’s participation in next month’s Winter Olympics in South Korea may help defuse tension in the region, Japan is escalating efforts to prepare its citizens for a possible war. Tokyo believes the threat po