I went to Vietnam a couple times. If you hang out downtown in the city, you might get a random Jehovah's Witness or Seventh Day Adventist* try to chat you up. "Oh, we can't do missionary work out in the open, so we just do one-on-one conversations like this". Despite the lack of "Jesus saves, die sinner" signs in Hanoi, you can definitely find Catholic and Protestant churches in Vietnam.
The Western press likes to piss and moan about settler nation missionaries that go, without proper visas mind you, to spread their Western versions of Christianity to the DPRK, only to get deported. So am I allowed to enter a white people country without a visa to stir up trouble and expect no consequences???
I'm the furthest thing from an expert on Myanmar. I get everything I know from Burmese friends. But if you look into the minority people situation, many of them are being heavily proselytised by the worst of the Amerikan type. I don't want the Pat Robertson's the world anywhere near struggling people.
*I'm definitely not saying that JWs and SDAs are anywhere near the worst as Christian sects go.
That's not a hot take. Any religion or pseudo religion that came out of the US (reinventions of Calvinism over and over) is milimetrically designed to rot the soul and the societies it infects
Long before the American empire, proselytizers had been the shock troops of colonization. Hence that quote about how when the Europeans showed up, they had the Bibles and the Africans had the minerals. Now the Europeans have the minerals and the Africans have the Bibles.