Emergency meeting held in South Korea following North's Big Parade

South Korea's government held an emergency meeting Sunday, less than 24 hours after North Korea displayed a slew of new strategic weapons, including a massive intercontinental ballistic missile (ICBM), at a military parade.

An emotionally-charged speech given by North Korean leader Kim Jong Un at the event — held to mark the 75th anniversary of the founding of the North’s ruling Workers’ Party — was discussed, South Korea's presidential office said in a statement.

The new weapons which included a submarine-launched ballistic missile (SLBM) and Seoul's defense capabilities against them were also talked about, that statement said. It added that inter-Korean agreements made to prevent mutual military confrontation and war "must be abided to."

Separately, a spokesman for the South Korean defense ministry said Sunday it had expressed "concern" over North Korea’s disclosure of weapons and was analyzing the new weapons in detail alongside Washington. A senior U.S. official told NBC News North Korea's display of weapons "was disappointing."