Can’t happen. The days of the NHL or KHL poaching players are over. The IIHF has tight control now.
Since the NHL isn’t party to the IIHF, USA Hockey and Hockey Canada basically act as the NHL’s agents for international transfers to North America. These 2 entities sign the transfer cards and thus have a vested interest in making sure everything is legal, or they will be held liable (punishment) by the IIHF for illegal signings.
Hypothetically I suppose the NHL could tell SKA and the IIHF to go screw themselves, then bring Michkov over early. But the NHL would also be throwing either USA Hockey or Hockey Canada under the bus in the process.