How to defend against an alien invasion.
Note: the alien ships will be capable of travelling through space, and they will have shields of some kind that will be capable of withstanding asteroid impacts at close to light speed. This would make their ships basically invulnerable to nukes.
Note: the aliens are after our resources (water, protein, nutrients). So simply destroying earth is not an option.
What options could the Earth's governments take to eliminate the aliens' threat, assuming that the governments of Earth unite to face this threat.
If I have left out any information that you would need to answer this question, comment and tell. Please don't close this post with out giving me a chance to fix whatever is wrong with it.
More details: Technology is the same as today.
Politically the is United under the newly-formed Earth Parliament. In response to the arrival of the aliens
- There are about twelve ships each is roughly the size of small City. Each equipment on nuclear Arsenal, however they are unlikely to use this Arsenal except as a measure of Last Resort and even then probably only against any popular cities. They want to leave the earth resources in intact.
3.there is altogether about twelve thousand aliens and about a third as many robots.
The alien force is not desperate people there merchants who take recourse of resource rich plants and sell them to others that are desperate.
The Aliens have almost as fast as light travel.
On land they use both microwave and projectile hand weapons with mounted laser canons.