Putin says South Korea would be making 'a big mistake' if it supplies arms to Ukraine

President Vladimir Putin said on Thursday that South Korea would be making "a big mistake" if it decides to supply arms to Ukraine and that Moscow would respond to such a move in a way that would be painful for Seoul. Putin, who was speaking at a news conference in Vietnam, was reacting to a report from Yonhap news earlier on Thursday which said South Korea would review the possibility of supplying weapons to Ukraine after Putin and North Korean leader Kim Jong-un signed a mutual defence pact a day earlier. Putin said Seoul had nothing to worry about when…