"When Japan, the organizer, sends an invitation, our military is supposed to let it know our decision. So far, we've not received any invitation so that nothing has been fixed," the defense ministry said in a brief release. 

Later in the day, Japan's Chief Cabinet Secretary Yoshihide Suga hinted that it may not send an invitation to South Korea, citing the "very difficult" situation in bilateral ties, according to Japan's Kyodo News. 

South Korea's envisioned absence serves as another sign of the deteriorated relations between the neighbors following Japan's implementation of export restrictions on South Korea, citing security concerns, in apparent retaliation against Seoul's top court ruling last year on wartime forced labor.  

In response, South Korea last month announced its decision to terminate its military information-sharing pact with Japan. 

Defenses ties between Seoul and Tokyo, in particular, have taken a turn for the worse since last December, when Japan claimed that a South Korean destroyer locked targeting radar on its surveillance plane. 

But South Korea dismissed the claim, saying the plane needlessly approached the ship, which was on a normal rescue mission. 

Amid lingering tensions, Japan skipped the multinational maritime drills held in South Korea in April this year. (Yonhap)