Enough effidence not only from Western Sources, but pro Russian onlines forums talk on Russian Airliners already grounded more Aircraft. Thus it is expected some of them will be canibalise to keep others running. The Video seems indicating some surprises on the canibalisation happen to the new ones, but actually it is expected.
The latest generation like A350 actually will be harder to find replacement parts from Black or Grey markets. Even those who can rebuild some Airbus or Boeing parts, will be those on 90's tech like 737NG, A320CEO, A330CEO etc. Those with relatively less electronics and more mechanical controls compared to latest gen A320NEO, A330NEO, let alone highly sophisticated A350.
Russia have big problem with wide bodies replacement. Despite all talks by Rostec to revive IL-96 I don't see they have enough resources to revive old USSR design as they have invest much for SSJ-100 and MC-21.
Russian sources shown after 2014 they already prepared 2 version of MC-21 as western parts MC-21 300 and Russian parts MC-21 310. All they can hope is to fly as much as possible of those Airbus and Boeing in their inventories before Rostec can curn out more Russian parts version of SSJ-100 and MC-21. After that they better hope for the best on their join endevour with China on Wide Body CR929.