This announcement is a geopolitical weapon that arrived immediately. It forces russia to consider a future where all kinds of things they deem relatively save right now suddenly become much less so. Its also a message to russia that more weapon systems are on their way and the West can see a future delivering them. Just this announcement alone will alter russian war plans.
Does russia decided to throw their forces onto the front now to get larger gains before these weapons arrive?
Does russia decided to hold back forces and move strategic assets outside of the possible range of these new weapons at the cost of battlefield gains and needed response time to Ukrainian counterattacks?
Have the weapons already been delivered and the announcement is just for show to give the appearance of a gap of time?
In the future when/if the weapons arrive is the second geopolitical, and at that time, actual physical weapon.