South Korean Foreign Minister Kang Kyung-wha, right, meets with Japanese Ambassador to South Korea Koji Tomita at the Foreign Ministry in Seoul, South Korea, Friday, March 6, 2020. Seoul expressed "extreme regret" Friday over Japan's ordering 14-day quarantines on all visitors from South Korea due to a surge in viral infections and warned of retaliation if Tokyo doesn't withdraw the restrictions. (AP Photo/Ahn Young-joon, Pool)

South Korean Foreign Minister Kang Kyung-wha, right, meets with Japanese Ambassador to South Korea Koji Tomita at the Foreign Ministry in Seoul, South Korea, Friday, March 6, 2020. Seoul expressed "extreme regret" Friday over Japan's ordering 14-day quarantines on all visitors from South Korea due to a surge in viral infections and warned of retaliation if Tokyo doesn't withdraw the restrictions. (AP Photo/Ahn Young-joon, Pool)

SEOUL, South Korea (AP) — South Korea announced it will end visa-free entry for Japanese citizens starting Monday in retaliation for a two-week quarantine imposed by Japan on all visitors from South Korea because of its surging viral outbreak.

South Korea’s first vice foreign minister, Cho Sei-young, also announced Friday that it will strengthen travel entry restrictions on all foreign citizens coming from Japan and could reduce the number of airports at which flights from Japan can land.

Cho’s announcement came hours after South Korea expressed “extreme regret” over Japan’s travel restrictions and warned of countermeasures.

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He said Japan’s move was based on a misunderstanding of South Korea’s active efforts to fight the virus, which he insisted were in contrast to Japan’s “non-transparent and passive quarantine activity” reflected by its much smaller number of virus tests.

“Our government once again expresses our deep regrets over Japan’s measures that it unilaterally announced without prior consultation or notification,” Cho told reporters. He did not take any questions.

Relations between South Korea and Japan sank to their lowest point in decades last year as they feuded over trade issues, wartime history and military cooperation. South Korea has not taken any countermeasures against more than 90 other nations that have banned or restricted visitors from the country.

The 14-day quarantine announced by Japanese Prime Minister Shinzo Abe on Thursday also will apply to visitors from China. The government in Beijing issued a softer response, with foreign ministry spokesman Zhao Lijian saying that Japan’s measures were “understandable.”

South Korea has confirmed more than 6,500 cases of infection with the new coronavirus, but its numbers of new cases have been declining in recent days.

South Korean Foreign Minister Kang Kyung-wha earlier on Friday summoned Japanese Ambassador Koji Tomita to protest Japan’s move and described it as “unscientific,” citing progress in the country’s quarantine efforts.

Tomita replied that Japan is facing a “critical period” that will determine whether it can successfully stem the spread of the virus. Japan counts more than 1,000 cases, including about 700 from a cruise ship.

Japanese Chief Cabinet Secretary Yoshihide Suga said the country’s strengthened border controls will also apply to Japanese citizens returning from South Korea or China.

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Associated Press writer Mari Yamaguchi in Tokyo contributed to this report.