Joy, disbelief as Korean families separated by war meet after 65 years

* 180 families to be reunited in North's mountain resort

* First family reunions in three years as relations thaw

* Families embrace in tears, joy, disbelief

* Reunions short and often traumatic for elderly

* More than 57,000 have registered for a reunion

* Family reunions in divided Korea: https://tmsnrt.rs/2vJPC63 (Adds details of reunion, quotes throughout)

By Hyonhee Shin

SEOUL, Aug 20 (Reuters) - About 90 families from North and South Korea wept and embraced on Monday as the neighbours held their first reunion events in three years for relatives wrenched apart by the Korean War for more than six decades.

The brief reunions are set to total just 11 hours over the next three days in the North's tourist resort of Mount Kumgang after the neighbours renewed exchanges this year following a standoff over Pyongyang's nuclear and missile programmes.

North Korean leader Kim Jong Un and South Korean President Moon Jae-in agreed to the reunion events at a summit in April.

About 330 South Koreans from 89 families, many in wheelchairs, embraced 185 separated relatives from the North with tears, joy and disbelief. Some struggled to recognise family not glimpsed in more than 60 years.

"How are you so old?" Kim Dal-in, 92, asked his sister, Yu Dok, after gazing at her briefly in silence.

"I've lived this long to meet you," replied the 85-year-old, wiping away tears as she clasped a photograph of her brother in his youth.

Siblings Kim Gyong Sil, 72 and Gyong Yong, 71, wearing the traditional hanbok dress, coloured pale violet, stood nervously staring at the entrance, awaiting their 99-year-old mother Han Shin-ja. They could not speak for minutes, wailed loudly and rubbed their cheeks and hands.

"When I fled home in the war...," Han said, faltering as she choked with emotion and left her sentence incomplete.

The separated families are victims of a decades-long political gridlock since the 1950-53 war ended in a truce rather than a peace treaty, with ties increasingly strained as Pyongyang rapidly stepped up its weapons programmes.

More than 57,000 South Korean survivors have registered for the family reunions, which usually end in painful farewells.

For years, Seoul has called for regular meetings between separated families, including the use of video conferences, but the programme often fell victim to fragile ties.

At his historic June summit with U.S. President Donald Trump in June, Kim pledged to abandon his country's nuclear programmes if Washington provided security guarantees, but the two sides have since struggled to agree how to reach that goal.