As for the SPIEF’s central event, it will be a plenary session as always and it is scheduled for Friday, Yury Ushakov said MOSCOW, June 2. /TASS/. Russian President Vladimir Putin will traditionally participate in the plenary session of the 2026 St. Petersburg International Economic Forum (SPIEF) on June 5 and will deliver a grand speech, Russian Presidential Aide Yury Ushakov said on Tuesday. "As for the [SPIEF’s] central event, it will be a plenary session as always and it is scheduled for