If it's a year later, then it is. The Russia won't be able to recruit soldiers after its economy collapses. They are in for salary and death compensation that is defined in Rubles. Once the Ruble compensation loses its value, relatives get less motivated for letting their sons go to the front. And when the 2000$ salary becones a 100 $ salary, nobody goes to war for that money.

Without soldiers the front cannot be kept.