I am trying to align the equations like the following image, but I have not been able to do so eventhough there probably is an easy solution:

I have tried a couple of things so far (and looked on stackoverflow), but this is the best I can do:

begin{align}
    max_{mathbb{P} geq 0}&quad sum_{k=1}^K f(xi_k)mathbb{P}_k\
    s.t.&
    begin{rcases}
        min_{Pigeq 0}& sum_{k,l = 1}^K ||xi_k - xi_l||Pi_{k,l}\
    s.t. & sum_{k=1}^K Pi_{k,l} = (hat{mathbb{P}}_mathcal{N})_l quad forall l=1,dots,K\
    & sum_{l=1}^K Pi_{k,l} = mathbb{P}_k quad forall k=1,dots,K
    end{rcases}leq theta
end{align}

which yields