South Korea stages massive military parade amid North Korean nuclear threat

South Korea held its first military parade in 10 years, showcasing missiles, tanks, and other weapons.
President Yoon warned North Korea not to use nuclear weapons and pledged support for the military.
The parade of thousands of troops and equipment took place in Seoul.
Yoon vowed immediate retaliation for any North Korean provocation.
The show of force comes as North Korea seeks Russian help expanding its nuclear arsenal.