They're worried about space invaders, not pirates.
It would be a funny twist if they completely fail in their attempts to bring down the shield and then somebody in Russia manages to do it.
Of course, that will never happen, because the heroes of the show have to win. And ass far as we know there are only one group of aliens helping out and they are in Charleston.
As I said, this is the equivalent of an Irwin Allen show, so I just sit back and enjoy.
I feel bad about Lourdes, though.