Reduce the IPC value of Timguska from 1IPC to 0 and increase the value of Yakuts to 2IPC, allow the Soviets 12IPCs for free on the turn Japan attacks.(like the old rule). This is a better balance as it is still up to the individual player as to what they want to do, but you would hope any player with common sense would use the 12IPCs to build a minor IC in yakuts