South Korea's olive branch to North
South Korea's president has urged North Korea to accept calls to improve ties with the South.
Relations between the rival Koreas are at their lowest point in recent years following the March sinking of a South Korean warship blamed on North Korea.
President Lee Myung-bak said in a speech that North Korea must "never venture to carry out another provocation, nor will we tolerate it if they do so again".
Mr Lee also proposed a path towards unification that would end decades-long hostility on the peninsula, saying reunification of the two Koreas will surely happen.
Mr Lee's speech marks the 65th anniversary of Korea's liberation from Japan's colonial rule.