(CNN) — Thailand launched airstrikes against Cambodia on Monday as a new wave of fighting erupted between the southeast Asian neighbors, leaving a peace plan presided over by US President Donald Trump just two months ago in danger of collapse.

Both sides accused the other of launching strikes along their disputed border in the early morning hours, after weeks of simmering tension and the earlier suspension of progress on the ceasefire agreement by Thailand.

The two nations have repeatedly fought brief border skirmishes in recent decades, with a deadly five-day conflict in July leaving dozens dead and displacing about 200,000 on both sides of the frontier.

Thailand’s Prime Minister Anutin Charnvirakul said the country “never wished to see violence,” but would “not allow the violation

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