ST. PETERSBURG, June 6 -- There was no hedging in how Vladimir Putin framed Russia's posture toward its partners at the plenary session of the St. Petersburg International Economic Forum on Friday. "We will do what we consider necessary for ourselves," he said, "and we will always fulfill our obligations to our partners."

The statement, brief and unadorned, carried weight precisely because of where it was delivered. The 29th edition of SPIEF - held under the theme "Pragmatic Dialogue: The Path to a Stable Future" - has become Russia's most consequential annual argument that it remains a reliable economic partner for countries disinclined to take sides in the conflict between Moscow and the West. On Friday, Putin made that argument in its...