Not officially it doesn’t.
Unfortunately, withdrawal means that you’ve just denied the rest of the airspace to yourselves While setting a poor example to other nations.
We might have to agree to disagree but the Russians do their best to subvert the intent of the treaty and have denied much of their airspace to our overflights. The treaty benefits Russia more than America. These flights are also expensive and I don't see to many other nations willing fund these flights.
I imagine in 2021 New Start will also be allowed to die.
Welcome to Great Power competition.