1.Medical professors at hospitals affiliated with Seoul National University began an indefinite walkout on Monday against the government's medical reform. The government urged SNU hospital leaders to consider requiring professors to compensate for losses incurred by the hospitals due to the collective action.

2.According to the Stockholm International Peace Research Institute, a Swedish think tank, on Monday, North Korea may have assembled up to 50 nuclear weapons and could produce more. The institute estimated that North Korea had up to 30 nuclear weapons last year.

3.The final declaration of the Ukraine peace summit in Switzerland was approved by 80 of the 93 participating states at the close of the two-day event on Sunday.