Extra-terrestrial Ownership of Land

Asgardia the first space nation has been created by globally renowned scientists, engineers, entrepreneurs and legal experts and anyone can be its citizen. It will be a member of the United Nations. Its aim will be prevention of Earth’s conflicts being transferred into space. It hopes to regulate space activities and its ownership.
I hope the community of Asgardia is select from all space faring and non-space faring countries of the Earth. I also hope some aliens have already not taken charge of this country and we are oblivious to this fact.
By 2030 China plans to mine Helium 3 from moon. 50 kgs of Helium 3 can light up the whole of America for one year. We don’t need dams, penstocks and turbines to manufacture power, we don’t need thermal plants, we don’t need nuclear power. We just need a few kgs of Helium 3 for our daily needs. Now imagine the race when America , European Union, China and other countries including India have technology to either produce Helium 3 from mining and separating and processing on the moon itself or alternatively transporting the lunar regolith to earth (this looks difficult in view of the huge quantity required to process a few kgs of Helium 3). Who can mine which location? How much any country can mine? Does America have an upper hand since it will have conducted many more missions comparatively and lay siege on more land to other countries! What if China goes far ahead and invests too much and equals in technology at a faster rate?
Asteroids are believed to have lots of metals and minerals. Platinum, Diamond, Gold is believed to exist in many asteroids. There are too many natural resources to be exploited. Asteroids are small. From a few meters to a few kilometres in length and breadth. If a space probe can grab and tag an asteroid what will be the reaction of other countries? There are billions of asteroids in the asteroid Belt located between planets Mars and Jupiter and millions between Sun and Mars which have gone astray due to gravitational pulls and tugs.
Since mythological times people and nations have claimed their proprietory of the Moon and Mars. Individuals and Organisations have sold land on Moon and Mars by making Lunar and Martian deeds. United Nations drafted a Outer Space Treaty and was signed by 102 countries. The International Moon Treaty was finalised in 1979 and enforced in 1984 yet only 15 non-space faring countries signed it until 2013.
There are disputes and no authority has come to a Universal solution acceptable to the entire globe.