Thai embassy in Cambodia will offer aid to a Thai convicted of planting landmines along Thai-Cambodia border and was sentenced to 20 years in jail, Thai Foreign Minister Kasit Piromya said recently.

The diplomats are looking into what assistance the government is able to provide, Kasit said.

In a hearing last week, Suphap Vong Pakna confessed to planting at least five explosive devices along the Cambodia-Thailand border, claiming Thai soldiers paid him to do so.

Pakna's lawyer says his client received a fair trial. "I think he is getting a fair judgment according to the evidence and his confession, because the court reduced the jail term from 30 to life imprisonment to 20 years in prison based on our terror law, article 75."

The 39-year-old was arrested in February of last year after he allegedly entered Cambodian territory and laid landmines.

A Thai investigation reportedly found Russian-made landmines in the area which they say were recently planted and of a type that Thai soldiers have never used.

Thai authorities said the findings suggested that Cambodia may have been guilty of breaking the 1997 Ottawa Treaty, which bans signatories from using anti-personnel mines.

Cambodia, however, dismissed the accusation, saying any landmines in the area were remnants of the three-decade war.

The group Landmine Monitor says mined border areas between Cambodia and Thailand have the highest concentration of landmines in Cambodia.