Without denying huge efforts of the Soviet industry to their war effort in WW2 the so much extensive propaganda of the Russians - then and now - that their war effort made them victorious (almost alone
) in WW2 some small facts prove that war materials provided by the West to them was important.
While in 1944 one would expect that all/most of the US/UK military equipment delivered to the Soviets has disappeared from the stock of the front line Russian troops would be wrong.
Just couple of years ago a British Matilda (later improved Mk and now very rare model) was dragged out of a river in central Poland which indicates that some of their regiments were operating this type of tanks to the end of the war.
It is restored now and a documentary film showed that everything was made of great quality so the tank would be "underway" soon.
The same with a Boston light bomber fished from the Baltic sea. Also aircraft from the USSR AF being on stock of one of the bomber regiments which was advancing Germany along the Baltic coast in 1944/45.
What is also avoided among the facts is that great deal of the aid was sent to Russia in the most critical moments of war.
One of the top three fighter aces of the Soviet Union , Khozedub scored 57 victories mounting Bell Aircobra and us such is presented on his American airplane standing in the open door of his P39. Only 6 were shot down by him while his unit was rearmed with Lavotchkin fighters. In his memories he assessed the Cobras as highly maneuverable in low level (which basic of the Russian air tactics) and with great fire power
In 1942/43 percentage of western delivered tanks, a/c etc. was some 30-40% of the Soviet army hardware in Kursk battle.
And the most stunning information I have read in the introduction of the Arctic Convoys (HM Naval Histroy issue) was that a relatively quick advance of the Russians army movement which was based on infantry and horses legs was caused by the delivery of 250 000(!!!!) just one type of trucks -Studebacker.
The above material says that ironically that the Soviets were faster than western Allies in run for Berlin was caused by the Americans and their deuces-an-a half.
Bad Americans !!!!
There is another sentence of meaning : the Brits of those times have seen that the Soviets requirement on Land-Lease materials on the end of war were aimed in building a stock for future, after war times.
gd