SEOUL, South Korea (AP) — Joined by his top military officials handling his nuclear-capable weapons and munitions factories, North Korean leader Kim Jong Un arrived in Russia on Tuesday before an expected meeting with President Vladimir Putin that has sparked concerns about a potential arms deal for Moscow’s war in Ukraine. North Korea’s official Korean Central News Agency said Kim boarded his personal train Sunday afternoon accompanied by unspecified members of the country’s ruling party, government and military. South Korea's military assessed the train crossed into Russia sometime early Tuesday, Jeon Ha Gyu, spokesperson of South Korea’s Defense Ministry, said...