South Korea on Monday proposed talks with North Korea to discuss what it calls a range of issues needed to prepare for the unification of the divided countries.

It's unclear if Pyongyang would accept Seoul's offer as the country has viewed any of South Korea's unification plans an attempt to take it over. North Korea wants a unified Korea with Pyongyang in charge.

Unification Minister Ryoo Kihl-jae told a televised news conference that South Korea wants talks in January to discuss exchange programs, joint projects and laws needed for a unified Korea. Ryoo said South Korea hopes the proposed talks would also discuss resuming reunions of families separated by the 1950-53 Korean War.

Seoul launched a government committee on the unification in July, six months after President Park Geun-hye told a New Year's press conference that unifying with North Korea would bring an economic "bonanza," not massive financial costs.

North Korea made an angry response, saying Park's plans were nothing but a plot to topple Pyongyang and build a unified Korea under a South Korean system.

U.N. Secretary-General Ban Ki-moon, a former South Korean foreign minister, welcomed the South Korean proposal and "sincerely hopes that the Democratic People's Republic of Korea authorities positively consider the proposal and engage in dialogue," U.N. spokesman Stephane Dujarric said.

The Korean Peninsula was divided into a U.S.-backed, capitalistic South Korea and a Soviet-supported, socialist North Korea after its liberation from the Japanese colonial occupation from 1910 to 1945.

The Koreas share the world's most heavily fortified border as the Korean War ended with an armistice, not a peace treaty. Animosities deepened when their troops traded gunfire along the border twice in October.

South Korean defense officials said Monday that Seoul, Washington and Tokyo have signed their first trilateral intelligence-gathering pact to better deal with North Korea's nuclear and missile threats.