North Korean leader Kim Jong Un issued a “small apology” for recently testing short-range missiles, U.S. President Donald Trump tweeted on Saturday following two further missile launches the same morning.

Trump was elaborating on a “beautiful” three-page letter he said he’d received from Kim on Thursday, in which the North Korean leader expressed dissatisfaction about pending U.S. – ROK military exercises.

“In a letter to me sent by Kim Jong Un, he stated, very nicely, that he would like to meet and start negotiations as soon as the joint U.S./South Korea joint exercise are over,” Trump said on Saturday.