Sinatrion exports during communism

One nice Lithynian sunny day on gramps's porch, with gramps, granny and little Deuzmatibrol. Gramps is storytellin', about Sin city. Listen!
"It was a wery pleasant morning when they arrived, if I remember correctly it happened in spring(one of the four seasons), on a saturday morning(one of the seven days of a week on the blue planet) when Chomborg, a Thrinat-class ship entered the city("Arad"), nowadays enhabited by even stranger humans. Probably due to the Sinatrion... Listen to me child! Don't be distracted!
So, as my grandfather told me, Chomborg, and it's crew, entered the little blue planet's only one Sinatrion rich city. In earthlike time, this happened after the second great war. The reasonable thing to do, was for the ship to take an earthlike shape, and that for the crew too, so they appeared as a russian tank division, led by an important political figure, who immediately took over the local leadership(easy to do, because we were far more advanced). We were good at that, just ask your granny, she'll tell you about her grandparents, who were the first Lithinians to be placed by our government in high roles, in a city called Moscow, the capital, and nursery of Communism, the ideology wich brought us the perfect context, to exploit one of the richest sources of Sinatrion in the galaxy.
So, the thing was, that after we've taken over the control, it was necessary to build the infrastructure, and start extracting the necessary amount of Sinatrion christals. The thing with our ship, was, that it could take many shapes, and realise a multitude of tasks, so the brave crew istalled them in various locations. To do this, they had to demolish aged human infrastructure and built large concrete structures, in wich to install the machines. They moved humans inside those cranked spaces called flats, and used the power generated by their minds to balance the christal exposure caused desease in our people. To this day humans think that communist ideology killed their soul, but the situation was generated mainly by us.
So like that, we've got our Sinatrion for the next thousand years. Our ships left "Sin city" exactly on time, before communism failed. Some of our kind still live there, they say, they can't let go. We communicate with them throgh commonly used radiowave frequencies, so we don't get detected. Nowadays we heard that they run establishments, and control nightlife in Sin city. Some of them became artists, and I've heard that a little crew opened an alternative art space...are you listening kid? I'll call your grandma to fix you a shot of S. I guess i'll have some too...hmm"