This is the tear-jerking moment a soldier knelt down to his mother before leaving to serve in an ongoing conflict.

The officer asked his mum for her shirt to carry with him on his mission to the Thai-Cambodian border amid unrest in the region, before bowing deeply to her in Bangkok, Thailand.

Heartwarming CCTV footage shows the woman coming downstairs to give the white shirt to her son on August 5.

The man then carefully cut a piece from the shirt before going down on his knees and lowering his head to the floor in front of his mother to bid her farewell.

They then embraced each other, tears flowing from both sides, before she gently helped him stand up.

According to Thai tradition, carrying a piece of a loved one's cloth is believed to protect a person from harm.

He had initially asked for his mother's traditional Thai sarong, known as a Pha Thung, but since she no longer wore one, she gave him a shirt she had worn seven years earlier, on the day of his ordination as a monk.

A bloody military confrontation flared in long-disputed border areas as Thailand and Cambodia accused each other of instigating the violence on July 24.

The Thai army claimed the clash began when six armed Cambodian soldiers approached a Thai outpost after a drone was heard near a disputed Khmer temple, which has been occupied by Thailand for decades. Thai troops said they shouted warnings and claimed the Cambodians opened fire first.

However, Cambodia's Defence Ministry accused Thailand of provoking the violence, saying its forces acted in self-defence.

Officials said at least 43 people have been killed and more than 300,000 displaced on both sides of the border.

Both sides have reached a truce at midnight on July 28, following talks facilitated by Malaysian Prime Minister Anwar Ibrahim, chair of the Association of Southeast Asian Nations (ASEAN).

He said: 'This is a vital first step toward de-escalation and the restoration of peace and security.'

US President Donald Trump had earlier threatened to pause trade deals with both countries if clashes continued.

He said after the ceasefire was forged: 'By ending this War, we have saved thousands of lives ... I have now ended many Wars in just six months — I am proud to be the President of PEACE!'