"The main problem is Shoigu and Gerasimov. It was the decisions of those two that blocked us from getting everything, despite the president saying that the ammunition was there"

Yevgeny Prigozhin's quote is referring to a scenario in which the president had actually promised that ammo was available, however the decisions of 2 people, Shoigu and Gerasimov, blocked the group from getting it. This suggests that the president's pledge was not fulfilled due to the actions of Shoigu and Gerasimov. Prigozhin is implying that the 2 are the main problem, which their choices are what prevented the group from getting the ammo. This might be analyzed as a criticism of the two, as Prigozhin is recommending that their choices were the cause of the group not getting what they were assured. It could also be analyzed as a criticism of the president, as Prigozhin is indicating that the president's guarantee was not fulfilled due to the choices of Shoigu and Gerasimov.