Why were North Vietnam and the Viet Cong allied with the Khmer Rouge?

The Khmer Rouge were nationalists who hated Vietnamese. Were they allies only because they had the same goal (to create a communist state)? According to English Wikipedia, they were allies in the Cambodian Civil War. https://en.wikipedia.org/wiki/Khmer_Rouge It's in the table at Allies. Later, the Cambodian-Vietnamese War broke out.

Can anyone give tips for traveling to Thailand during the rainy season?

I think that during the rainy season, perhaps different activities could be emphasized than in many travel reports outside of the rainy season. I'm planning a backpacking trip, perhaps to places that aren't yet completely touristy. Hiking or other activities are welcome. Just anything you can think of. Thanks 🙂

Is this propaganda film meant to whitewash the crimes in Vietnam?

The film is beautifully made as a Rambo film, but it distorts the moral of world history. Who is responsible for this distortion of history? What are children actually being taught in German schools about the Vietnam War? Little Vietnam, Laos, and Cambodia were destroyed by the USA. bombed in the most brutal way, and…