The recently delivery of a French-made warship to Russia has made me wonder if the USSR's weaponry was entirely domestic.
I'm aware they acquired plenty of American weaponry during WW2. I just wonder how much if any weaponry from neutral or even western countries they purchased. Even purchases from other Warsaw Pact/Socialist countries would be surprising.
The info published by the US government in 1985 indicates that weaponry accounted for .9% of Soviet imports that year. The table on the next page indicates that between 1981 and 1985, the Soviets imported 2 billion dollars worth of munitions from Poland, and 1.1 billion worth from Czechoslovakia.
I don't know much about the Polish arms industry in the Cold War, but I know the Czechs produced heavy tanks under Soviet license in Slovakia, and had a budding aviation industry in the Czech Republic area. They were also known for their artillery if I do recall, and I seem to remember something about the Soviets importing some of it. Not sure though.
Along the same vein, who was willing to sell to the USSR at all? Im assuming given the stereotypes of Russian weaponry that they produced everything themselves i.e. Ak-47s, BMPs, T-60 tanks etc. I say this since every other industrially capable nation would likely already be in NATO and opposed to the USSR i.e. France, Britain, Sweden.