Evaluate the strength and effectiveness of the Soviet Air Force by 1944.Did Allied Lend-Lease aid contribute to that?

By 1944, the Soviet Air Force was very strong and very
effective.  This was because of improvements in the quality of the Soviet aircraft and
better training and doctrine for the personnel.

At the
start of the war, the Soviets had relatively poor airplanes and did not use what they
had very well.   Their pilots were poorly trained and the air force did not do a good
job of protecting planes on the ground from German air
attacks.

By 1944, however, this had changed completely.  By
that point, the USSR had two very effective fighters for use against the Germans.  These
were the Yak-3 and the LA-7.  By the end of the war, these excellent airplanes were
being produced in enough numbers that the USSR gained air superiority over the Eastern
Front.

The USSR's Air Force, then, was very strong by the
end of WWII.  This strength came not from Lend-Lease, for the most part, but from the
creation of newer and better airplanes within the USSR and from better training of its
personnel.