North Korea has increased its nuclear arsenal, citing Iran's recent vulnerabilities as a justification for its own program, a move that has raised concerns among regional and global powers.

<img alt="A man stands on a balcony while a large cloud of smoke billows below." height="349" src="https://i.cbc.ca/ais/0eb83691-a376-4d4b-902a-4a0ddfc720d8,1775050213974/full/max/0/default.jpg?im=Crop%2Crect%3D%280%2C2%2C2000%2C1125%29%3BResize%3D%28620%29" title="North Korean Leader Kim Jong-un observes a ground ejection test of a high-output solid-fuel engine using carbon fibre composite materials, in this picture released by North Korea&apos;s official Korean Central News Agency on March 29,...