Why America is obsessed with not letting Russian-built anti-missile systems getting purchased and installed by different nations [COMPACTIDEA]

"In 1998…I was being constantly visited by the ambassadors of Great Britain, the United States and EU member states. Their message was the same: that the missile system must not be installed in Cyprus because this would create tensions in the region and would undermine, supposedly, the prospects for a peaceful resolution of the Cyprus problem and would pose difficulties to the fulfilment of Cyprus’ EU ambitions."

"Of course, behind these arguments lay the concern, mostly of Britain and the United States, over the capability of the Russian missile system to end the exclusive monitoring of the region by British radars." [link]

US is obsessed about it being the only country in the world with a global missile warning and shield system. US behaves like a fish out of water when there's talk about some country thinking of buying Russia's S-300, Antey-2500, S-400, etc., anti-missile systems. US doesn't want Russia to be able to have radar monitoring of various regions of the world. Neither does it want to give Russia the capability of eventually connecting/integrating its various systems deployed by different countries into a single, global system. So US tries its best to stop different nations from buying a Russian system.

UPDATE:

"US Goes Mental Over Turkey's Deal With Russia on S-400 Supplies - Erdogan" [link]