Earth a free, living planet today, thanks to one advanced alien race or other

Those wacky Russian scientists:

Did a UFO deliberately crash into a meteor to save Earth 100 years ago? That’s what one Russian scientist is claiming.

Dr. Yuri Labvin, president of the Tunguska Spatial Phenomenon Foundation, insists that an alien spacecraft sacrificed itself to prevent a gigantic meteor from slamming into the planet above Siberia on June 30, 1908.

I think he’s jumping to conclusions, here. Did the alien spacecraft collide with the asteroid to save the Earth? Or did the more advanced alien civilization send the asteroid to destroy the spacecraft before it could begin the invasion and enslavement of the Earth?

Hat tip Conservative Grapevine