​In his speech​, the text of which was released on Tuesday, Mr. Kim said one of the best decisions he ​had made following the ​breakdown of talks with Mr. Trump in 2019 was to double down on expanding his nuclear arsenal.​ Since then, Mr. Kim has ​urged his country ​both to build a “self-reliant economy” ​capable of endur​ing sanctions ​and to make more nuclear warheads ​along with a wider range of ​delivery missiles.