Originally Posted by
Heathrow Harry
the one on the right is a twin engined Tupelov ATN-37 I think
the large one could be a TB4/ANT-6 or an ANT 16 but in the latter case it should have an engine mounted above the fuselage as well (!!!)
The one on the right is a three engined aircraft, possibly the ANT-9. The larger aircraft on the left is a puzzle. High wing, fixed undercarriage with what appears to be 4 engines. I thought perhaps it might be the ANT-14 but that had a fifth engine in the nose.
The frontal view looks like the Fokker XXXVI but that first flew in 1934. However very unlikely and I am sure it wouldn't have been undergoing maintenance out in the open in Moscow.