Russia has repeatedly struck Ukraine's energy infrastructure, risking a nuclear disaster.

After Russian missile strikes knocked out power to multiple nuclear facilities in Ukraine, including Chernobyl, the International Atomic Energy Agency (IAEA) released an urgent safety warning. Nuclear facilities impacted The nuclear watchdog reported that power line disruptions also impacted other Ukrainian nuclear plants.

The comments follow the recent expiration of an important nuclear arms treaty.

Global alarm is growing after the last remaining nuclear arms control treaty between the United States and Russia officially expired. The United Nations has issued a stark warning, calling this a “grave moment” for global security as all binding limits on the world’s largest nuclear arsenals disappear.

The risks of this stand-off have been contained over the years by various arms-control agreements, most recently New START. But that treaty expired this week, with no replacement. To make matters more dangerous,

The ending of the START treaty removes any caps on the world's two largest nuclear powers for the first time in more than 50 years.