Russian President Vladimir Putin is raising the prospect of nuclear war in Ukraine.

Iran remains on a path of nuclear escalation.

U.S. nuclear armed submarines will dock in South Korea for what national security officials are calling occasional visits.

Russia was suspending its participation in a nuclear treaty with the US.

North Korean leader Kim Jong-un has warned he is ready to use nuclear weapons against rivals the United States and South Korea.

The idea that more nuclear weapons make you safer is an illusion.

Beyond a certain point, more nuclear weapons make you less safe.

The idea is to reduce the arsenal safely on both sides to a minimum deterrent. So if the worst does happen, the global

civilization and the human species are making a comeback.

Sure, they were never actually gone,

but Russia's invasion of Ukraine and Putin's repeated use of nuclear threats

has resurfaced decades old concerns about proliferation and the possibility of nuclear war. To make matters more complicated

Russia isn't the only concern. China, for example, is rapidly expanding its own

arsenal and some fear a possible nuclear is rapidly expanding its own arsenal,

and some fear a possible nuclear escalation over Taiwan.

North Korea, always a wild card, continues

to test ballistic missiles, and Iran is moving forward with its push to join the

nuclear club. Meanwhile the United States which guarantees nuclear security to

at least 30 countries is still advancing its own nuclear

capabilities. I'm Gabrielle Sierra and this is why it matters. Today an

introduction to the world's ongoing nuclear dilemma and a look into how

Russia's war in Ukraine may have brought nuclear war back onto our radar. So I know my parents lived through

...