The South Korean government is closely watching signs of a possible summit between U.S. President Donald Trump and North Korean leader Kim Jong-un, after Trump expressed plans to meet Kim later this year and Pyongyang responded with caution but not an outright rejection of the proposed dialogue. Earlier this week, The Wall Street Journal reported that Trump was seeking to revive summit diplomacy with Kim, following their meetings during the U.S. leader's first term. Trump confirmed to reporters Wednesday (local time) that he expects to meet with Kim later this year. Trump also offered an unusually specific assessment of North Korea’s nuclear capabilities, saying Pyongyang now possesses 57 "very powerful" nuclear weapons. Kim Yo-jong, the North Korean leader’s powerful sister, responded Wednesday in a statement carried by Pyongyang’s Korean Central News Agency, saying she was unaware of any recent communication between Trump and Kim, but acknowledged that the two leaders had an “excellent” personal relationship. Her remarks did not directly accept Trump’s overture, but South K