Actually, I'm rather miffed that Britain gave all that help to Russia....By the War's end, their production figures were almost as impressive as the US, particuarly fighters, but they never really built a decent bomber themselves....and when they started to, post-war, it was a copy of a B-29, a stolen design from 3 that had forced-landed in Russia.....
But from a 'colonial' point-of-view, the aircraft that Churchill 'gushingly' gave Stalin in the early stage of the War, deprived 'Fortress Singapore' of some decent fighters to help defend the invasion of Malaya......
In fact, at the end of August 1941, Churchill gave Stalin 200 Hurricanes in addition to the 40 already supplied, with 200 Tomahawks promised from deliveries due from the US...Consequently, Singapore was refused further proposed reinforcements....In effect, the few RAF, RAAF and RNZAF pilots there, had to tackle a huge Jap invasion force with 170 crapped-out Buffaloes the US had 'off-loaded' on the RAF Purchasing Commission, the odds of 16 to one being fought by the Allies against far superior Jap aircraft.....The RAF High Command were in total denial about the Japanese Aerial abilities, and once again the colonials suffered....it was like another 'Gallipoli'....
In the face of Stalin and Hitler's 'non-aggression pact' earlier, and then Hitler reneges by invading Russia, Churchill chummys-up to Stalin at the great expense of colonial lives.....He could've just let what the US contributed to Russia, the P-39's and P-40's do the job....By the time Hurricanes reached Singapore, were uncrated and ready to fly, and pilots orientated, it was too bloody late....
In my opinion, the best bombers the Allies had in Asia and Pacific, earlier-on, were the Hudson, and then the Venturas.....
The only use Russia was to the rest of the Allies, was as that 'second-front', and we should've let them battle it out, it was obvious that Germany couldn't possibly gobble-up all of Russia; the lessons of Napolean weren't that old to learn from, and for the Lancasters sorting-out the Tirpitz.....apart from that, they were secretive, selfish and greedy buggers......