SEOUL, South Korea (AP) — President Donald Trump sent a personal letter to North Korean leader Kim Jong Un, seeking to maintain good relations and offering cooperation in fighting the viral pandemic, Kim’s sister said Sunday. The latest correspondence came as Kim observed the firing of tactical guided weapons over the weekend, drawing criticism from South Korea, as the nuclear talks remain deadlocked. In a statement carried by the Korean Central News Agency, Kim’s sister and senior ruling party official, Kim Yo Jong, praised Trump for sending the letter at a time when “big difficulties and challenges lie ahead in the way of developing ties” between the countries. In the letter, she said Trump explained his plan to “propel the relations between the two countries … and expressed his intent to render cooperation in the anti-epidemic work” in an apparent reference to the global coronavirus outbreak. She said her brother expressed his gratitude for Trump’s letter.