What the article is describing isn’t a good thing. It’s basically saying that efforts to denuclearize have stalled over the last few years and things are creeping back to the danger zone.
As examples, Guterres has expressed deep concern at the escalating disputes between the Trump administration and China. Relations between the U.S. and Russia are at a low point. Nuclear-armed India and Pakistan are feuding over Kashmir, and India just had a border skirmish with China. And North Korea boasts about its nuclear weapons.
Without naming any countries, Guterres said programs to modernize nuclear arsenals “threaten a qualitative nuclear arms race,” not to increase the number of weapons but to make them “faster, stealthier and more accurate.”
Guterres also pointed to the only treaty constraining the size of the world’s largest nuclear arsenals — the New Strategic Arms Reduction Treaty between the United States and Russia — which is set to expire next year.