[mars]

Chinese and Soviet began to negociated the Soviet Military aid to China in Sep 1937, among the first request from Chinese included 200 aircrafts, on March 3,1938, China and Soviet signed the first contract, in which Soviet promised to send China 62 SB, 94 I-16, 62 I-15bis, 4 UT-4 and 6 TB-3, all of those aircrafts would be delivered to chinese before Jun 10, actually first patched of Soviet aircrafts (31 I-16 and 31 SB ) with their VVS crews started arived in China on Oct 27,1937, and Soviet fighter pilots flew their first combat sorties on Dec 1 1937 over Capital Nanjing, at the same time, CCF pilots started their conversion to Soviet aircrafts in Nov 1937 and to Spring 1938, CCAF already received 94 I-16, 122 I-15bis, 62 SB and 6 TB-3
In the Second Soviet-China contract, signed on Jun 20 1939, Soviet agreed send to China 24 DB-3, 36 SB, 30 I-15bis,30 I-16, and in later 1939, Soviet again agreed send to china 8 I-15bis, 4 UT-4, 10 SB, 8 R-10 and 8 I-16.
between 1940 to 1941, Chinese again received from Soviet 100 SB, 76 I-153, 65 I-16, 9 I-15bis.
Sum up, until Oct 1941, Chinese received from Soviet: 904 aircrafts (318 bombers, 542 fighters and 44 trainers)