What is the 1973 CIA UFO report from the Soviet Union?

“On a late-summer evening in 1973, a source at the Sary Shagan Soviet weapons testing range observed 'an unidentified sharp (bright) green circular object or mass' that widened into 'several green concentric circles' before fading — without sound.”

Catalog entry CIA-UAP-D001 (UAP.WATCH ID DOC-137) is a Central Intelligence Agency Intelligence Information Report from December 1973 describing human-source intelligence on the Sary Shagan Soviet anti-ballistic-missile testing range. In paragraph 14 of the report, the source describes stepping outside Site 7 during a televised Canada-USSR hockey match and observing an 'unidentified sharp (bright) green circular object or mass in the sky' at an angle of sighting of approximately 70 degrees. Within 10 to 15 seconds, 'the green circle widened and within a brief period of time several green concentric circles formed around the mass. Within minutes the coloring disappeared. There was no sound, such as an explosion, associated with the phenomenon.' The report is rated CONFIDENTIAL and notes the source 'had no opinion as to what this phenomenon was.' Paragraphs 1 through 9 and paragraph 12 of the original report were withheld entirely from declassification.