Thailand's army has accused Cambodia of breaching a newly signed ceasefire deal reached after weeks of deadly clashes that forced nearly one million people from their homes.

In a statement, the Thai army reported over 250 unmanned aerial vehicles (UAVs) detected flying from the Cambodian side on Sunday night.

The ceasefire took effect at noon local time (05:00 GMT) on Saturday, with both countries agreeing to freeze front lines, ban reinforcements, and allow civilians to return home.

This agreement was seen as a breakthrough after days of diplomatic talks, with support from China and the US.

However, the Royal Thai Army described Cambodia's actions as provocation and inconsistent with the ceasefire's terms, stating they might reconsider releasing 18 Cambodian soldiers detained in Thailand since July.

The incident, described by Cambodia's Foreign Minister as a minor drone issue, follows recent praises from China's Foreign Minister and US President for the ceasefire's establishment.

The long-standing border dispute has recently intensified, ignited by previous clashes and longstanding historic tensions between the two nations.