My initial reaction was that the OP was trying to start a discussion on the ethics of the Prime Directive but apparently not.
Anyways, I think we'd want to go with discreet observation until they put out the welcome mat with voyager probes & such. Once they start looking for alien life we'd have to respond - any deception from that point on would make future diplomatic relations extremely difficult.
Of course, our policy of observation would probably get thrown out the window as soon as there was any kind of indiginous crisis. Some space-capable private organization would want to intervene for humanitarian purposes and even if they were completely sincere it would probably degenerate into exploitation for labor & resources pretty quickly.
Anyways, I think we'd want to go with discreet observation until they put out the welcome mat with voyager probes & such. Once they start looking for alien life we'd have to respond - any deception from that point on would make future diplomatic relations extremely difficult.
Of course, our policy of observation would probably get thrown out the window as soon as there was any kind of indiginous crisis. Some space-capable private organization would want to intervene for humanitarian purposes and even if they were completely sincere it would probably degenerate into exploitation for labor & resources pretty quickly.