SEOUL, SOUTH KOREA (AP) - South Korea has threatened to end a military intelligence sharing agreement with Japan as their tensions escalate over export controls.
The agreement is a symbol of the countries' trilateral security cooperation with their ally, the United States.
Tensions erupted after Japan tightened export controls on key materials for South Korea's semiconductor industry and decided to downgrade South Korea's trade status.
Seoul accuses Tokyo of weaponising trade to retaliate over political rows stemming from their wartime history.
Seoul is seen trying to pressure Washington into mediating the dispute between its allies.
Japan says it wants to keep the agreement, whose renewal deadline is coming up on Aug 24.
A look at the military agreement between Seoul and Tokyo tested by a toxic relationship:
The General Security of Military Information Agreement, or GSOMIA, went into effect in November 2016 as the two neighbours agreed to step up cooperation in the face of North Korea's nuclear and missile threat.
It is automatically extended annually unless either side notifies the other of its intention to terminate in a 90-day prior notice. The deadline falls on Aug 24.
The agreement took years of discussion and a near-collapse. Any military cooperation with Japan is difficult due to strong resentment against Japanese brutality during its 1910-1945 colonisation of the Korean Peninsula.
South Korea and Japan can still share intelligence through the 2014 three-way intelligence pact via Washington, but that one is limited to North Korea's nuclear and missile programme. GSOMIA allows Seoul and Tokyo to share a broader range of information directly and more quickly.
South Korean military officials say information gathered by Japan's intelligence satellites, radars, patrol aircraft and other high-tech systems were crucial for analysing North Korea's missile tests and activities of its submarines, which could soon be equipped with missile-launch systems.
Japan also benefits from South Korean military radars positioned to detect North Korean launches sooner and Seoul's information gathered from spies, defectors from North Korea.
In 2012, Japan and South Korea backed off from an intelligence-sharing pact less than an hour before a planned signing after Seoul succumbed to political outcry at home.
Tokyo says it wants to keep the agreement despite difficult relations with Seoul.
South Korea says Japan's trade curbs have forced it to review whether it could continue to send sensitive military information to a country that questions its reliability as a security partner.
Japan said tighter export controls are needed as South Korea's trade controls are weak, but they earlier linked the export controls to South Korea court rulings ordering Japanese companies to compensate victims of wartime forced labour.
Some lawmakers also suggested South Korea may have allowed sensitive materials to reach North Korea. That enraged many in South Korea, triggering boycotts and protest marches, and lawmakers demanded their government to end the intelligence-sharing agreement.
Recent surveys indicate more South Koreans were in support of scrapping the agreement.
Japan's Defence Minister Takeshi Iwaya told reporters on Wednesday that he and visiting US Secretary of Defence Mark Esper agreed on South Korea's importance in dealing with North Korea.
Mr Noh Young-min, chief of staff to President Moon Jae-in, said Seoul will make a "comprehensive judgment based on national interest" before the Aug 24 deadline.
Even if South Korea keeps the agreement, threatening to end it might have been a mistake as it would affect long-term trust, said Dr Du Hyeogn Cha, a visiting scholar at Seoul's Asan Institute for Policy Studies.
"Instead of making a strong request for US mediation based on goodwill, (Seoul) is attempting to hold the United States hostage, saying 'things can become frustrating for you too'," said Dr Cha, an ex-intelligence secretary to former South Korean President Lee Myung-bak.
A senior Japanese official close to Prime Minister Shinzo Abe, who spoke on condition of anonymity to discuss a sensitive matter, said Japan could probably live without the agreement because it has been utilised less than expected and that Tokyo can get information from Washington.
The pact doesn't obligate Seoul and Tokyo to share information and exchanges apparently slowed as relations deteriorated amid nuclear negotiations between Washington and Pyongyang.
There have been 48 exchanges of military intelligence over the three years since the agreement took effect, with each side contributing information 24 times, South Korean lawmaker Ha Tae-kyung said, citing data he obtained from Seoul's Defence Ministry.
Mr Ha said 19 of Japan's cases came in 2017, during a provocative run in North Korean weapons tests.
Japan says they communicated some 30 times over the past three years, including only once in 2018 when North Korea's missile threat subsided.
Some analysts say a scrapped deal would threaten to erase a decade of US effort to link its separate alliances with South Korea and Japan to deal with North Korea and China's growing influence.
"The South Korea-US alliance will run into trouble," said Mr Moon Seong Mook, a former South Korean military official and current analyst for Seoul-based Korea Research Institute for National Strategy.
"A link for security cooperation between Seoul, Washington and Tokyo will be broken."
Scrapping of the intelligence-sharing agreement with Tokyo could make it harder for each of the two neighbours to respond to actions from China and Russia, including their joint bomber patrol over waters between South Korea and Japan last month, which experts say was likely designed to test security cooperation between the US allies.
Japanese experts, however, see emboldened South Korea as signalling its shift away from the US-led trilateral cooperation as the US presence in the region wanes.
"South Korea under the Moon administration appears to be not as enthusiastic about the trilateral cooperation with Japan and the US as South Korea used to be in the past," Dr Junya Nishino, a Korea expert at Keio University, recently said on a TV talk show.
"President Moon thinks the current framework is a legacy of the Cold War era and should be changed."