After the United States struck Iran’s deeply buried nuclear sites, questions are mounting over North Korea’s own underground defenses. Pyongyang may now see its bunkers as vulnerable, raising fears of increased military escalation.

North Korea said on Monday it strongly condemns the U.S. strikes against Iranian nuclear facilities as a grave violation of a sovereign state's security interests and territorial rights, the North's state media reported.

Trump says Iran’s nuclear program was obliterated, but questions remain about Iran’s capability and the location of hundreds of pounds of highly-enriched uranium.