That is exactly the case, and there is a good reason: Corruption. It HAS to have "strings" attached, Brazil is truly unable to deal with the problem they themselves instigated as State policy. It is Brazil fault, you have to trample its sovereignty by sending UN troops. An UN security council resolution can fix this, and they don't have power of Veto.
Well, i would send them to all countries that share the Amazon, even mine, of course. Maybe the UN could also put a stop to the illegal mining garimpeiros have been doing for decades under such hellish conditions people here would vomit in disgust if they learned about their camps...
But of course, that is all an unknown to the world top leading countries they just buy the minerals, no questions asked. Prostitution? Check, underage? check, slavery? check. But wait, there is more, you just will never know...
Send the troops or shut up. Don't be naive with the money thing, none of these countries deserve that territory anyway, its a Stateless reality where only organized crime rules.
The jungle, looks so beautiful from afar, except for the (slash & burn) farmers, they want it all clear and leave the place barren as a desert.