There is a limited nuclear exchange in 2019. March of 2019. That does involve North Korea. They attempt to launch a nuclear missile at Honolulu in Hawaii. And then the US responds with two cruise missiles nuclear-laden missiles to Jong Un and takes them out. So, Kim Jong Un was no more at that point .With the turmoil that ensued after that, World War III did start in 2020. It was a limited war though, thankfully, it only lasted three years. China and Russia were against the UK, America, and a few other countries it was a very fast but brutal war. Countless millions were killed. Nuclear weapons were used in a very limited capacity.