The second scenario is really interesting, as this could give Pyongyang access to a wider variety of fighters, instead of being limited by what they currently have.
That said, if Russia starts doing that, it might pave the way for China as well. In military terms alone, China has the best light fighter options (JF-17, J-10), while Russia can offer heavy options (Sukhoi family) and also have hundreds of MiG-29s, Su-25s and even Su-24s in reserve, which could be quickly transferred to Pyongyang after a rapid refurbishment and upgrade process.