Middle East military tensions around Syria shot up again Monday, June 18, with the news reported by the semi-official Iranian news agency Fars that a joint Russian-Chinese-Iranian exercise is to take place in Syria.

It was described as “the biggest of its kind ever staged in the Middle East” with 90,000 personnel, 400 air planes and 900 tanks taking part.

As part of its preparations, Beijing is reported to have asked Egyptian authorities to permit the passage through the Suez Canal in late June of 12 naval ships heading for the Syrian port of Tartus, where Moscow maintains a naval and marine base. DEBKAfile reported earlier this week that Russian naval vessels with marines on board were heading for Tartus. The Iranian media did not itemize their contribution to the joint exercise.

DEBKAfile stresses that this would be the first time that substantial Russian and Chinese military strength has ever been deployed in Syria or anywhere else in the Middle East. It means that the two powers are prepared to parade their unabashed partnership with the Iranian and Syrian armies for the shared purpose of obstructing US-European-Arab military intervention in Syria. A large-scale Russian and Chinese military presence in the embattled country would expect to deter the United States from leading a military operation against Bashar Assad and his regime.

No date was attached to the report but the exercise may possibly take place before the end of the month

The large-scale maneuver was announced in Tehran on the first day of the nuclear crisis talks in Moscow between Iran and the six world powers, their third attempt to resolve the crisis by diplomacy. However, Russian and Iranian sources close to the talks were pessimistic about progress. An Iranian delegation member complained the atmosphere was harsh and unconstructive. A Russian source saw no way of bridging US-led Western differences with Tehran when the parties reconvene Monday.

DEBKAfile also notes that the big joint Russian-Chinese-Iranian exercise “at sea, air and land on Syrian soil,” ws released for publication shortly before US President Barack Obama was due to meet Russian President Vladimir Putin at the G-20 summit in Mexico.