  We consider the one-chain term in a skeleton expansion for Euclidean QCD
observables. Focusing on the particular example of the Adler D function, we
show that although there is a Landau pole in the coupling at Q^2=\Lambda^2
which renders fixed-order perturbative results infinite, the Landau pole is
absent in the all-orders one-chain result. In this approximation one has
finiteness and continuity at Q^2=\Lambda^2, and a smooth freezing as Q^2
decreases to 0.
