By Park Si-soo

Leaders of the two Koreas will talk over the inter-Korean hotline "soon," South Korea's presidential office said in yet another sign of inter-Korean rapprochement before the historic summit between North Korean leader Kim Jong-un and U.S. President Donald Trump in Singapore on June 12.

The hotline was installed before the April 27 inter-Korean summit -- one fixed-line telephone on President Moon Jae-in's desk at Cheong Wa Dae and the other on Kim's desk in Pyongyang. But the line has not been used.

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A presidential office official said it was uncertain when the two leaders would talk over the line, but it would take place "sooner or later" because they would feel the need to talk before the Kim-Trump summit.

Moon plans to meet Trump in Washington on May 22, so the hotline talks between Moon and Kim are expected before this.