In a significant sign of vulnerability, Russia has abruptly canceled its flagship Navy Day parade in St. Petersburg, a major annual showcase of military strength. -The Kremlin cited vague “security reasons,

MOSCOW (Reuters) -Ukrainian drones targeted St. Petersburg on Sunday, Russian authorities said, forcing the airport to close for five hours as Vladimir Putin marked Russia's Navy Day in the city, despite the earlier cancellation of its naval parade due to security concerns.

NATO aircraft were scrambled Sunday night to respond to a Russian attack on Ukraine, the Polish military said Monday.