Moscow plans to deliver already contracted ground-to-air missile systems to Syria, Russian officials said Friday, pressing ahead with an arms transfer that U.S. officials say could significantly strengthen Damascus’s ability to ward off an attack....

Russian state television, reporting on Mr. Lavrov’s trip, went beyond the official line: “After the S-300s are put into service, a repeat of the Libyan scenario—the imposition of a no-fly zone over the country—would be extremely difficult,” said the Vesti-24 channel.