@sahureka this is my reading as well, for reasons known to ID MOD they feel the need to build up forces quickly, hence the J-10B, 053H3, 039A etc. However i would logically expect them to put in orders for brand new fighters, corvettes and subs, that will inevitably take longer to fulfill, hence the second-hand stopgap. They might even return the second hand ships/planes in a buy-it-back kind of deal once the new ships/planes arrive, but this is just a theory.