South Korean media outlet Yonhap reported that the projectiles were fired from the Democratic People's Republic of Korea's South Hwanghae Province. In a statement the JCS indicated that officials are "monitoring the situation in case of additional launches."
The launches come just a day after both US and South Korean militaries scaled down joint military drills.
A spokesperson for North Korea's foreign ministry released a statement following the tests, warning it could find a "new road" if joint drills continue. "Although the US and South Korean authorities are playing all sorts of tricks to justify the joint military exercise, its aggressive nature can neither be covered up nor whitewashed in any manner," the statement reads, according to Yonhap.
"The US and South Korean authorities remain outwardly talkative about dialogue. But when they sit back, they sharpen a sword to do us harm," it continues. "If this is what they call 'creative approach' and 'imaginative power beyond common sense,' we will be compelled to seek a new road as we have already indicated."
"We remain unchanged in our stand to resolve the issues through dialogue. But the dynamics of dialogue will be more invisible as long as the hostile military moves continue," the statement adds.
Pyonyang's first launch since North Korean leader Kim Jong Un and US President Donald Trump agreed on resuming denuclearization talks came on July 25. At the time, officials revealed that the country had deployed two projectiles into the Sea of Japan, and that the missile launches were a "warning" against "South Korean warmongers."
Following the first initial test, South Korean presidential official Cheong Wa-Dae revealed to Yonhap that the projectiles that North Korea had tested were of a "new kind of short-range ballistic missile."
Following the three missile tests by North Korea, Trump has responded by stating that he is unbothered by the Pyongyang's action, stressing that his "relationship is very good with Chairman Kim."
Prior to the recent tests, North Korea hadn't conducted any missile launches since May 9.