
"Surely the most important task for these countries"
Actually, no. Other countries have absolutely no reason whatsoever to pander to the whims of the uneducated who insist that there even *is* a mystery.
Such people may wish to visit www.clavius.org or www.badastronomy.com if they want "the truth". Or they could continue living in a paranoid/delusional fantasy-world wherein the US govt can keep a 500,000-person conspiracy hidden, but cannot hide a single blow-job.
And AFAIK, neither of these probes have a resolution high enough to spot the landers. The moon is a lot larger than you may suppose, and the landers are very small. Anyway, even should such pictures emerge, it wouldn't matter to the truly committed conspiracy nuts.
Fortunately there is another US probe going up soon (the name escapes me) that will, indeed, have a spectacularly fine-resolution camera, and may well return pictures of the landers. (But not of the cheap, store-bought flags, which will have long-since been destroyed by the decades of UV.).
This may serve to convince a few fence-sitters of the reality of, well, reality. But the lunatics (pardon the pun), and the charlatans making money of this ridiculous urban legend, will decry it as a photo-chop from the eeevil NASA, who are still following the commands of the Illuminati, after all.