From Wikipedia, references for more details at the link:
Military cooperation
The Syrian port city of Tartus hosts a Soviet-era naval supply and maintenance base, under a 1971 agreement with Syria. The base was established during the Cold War to support the Soviet Navy's fleet in the Mediterranean Sea. Since Russia forgave Syria of three-fourths, or $9.8 billion, of its $13.4 billion Soviet-era debt and became its main arms supplier, Russia and Syria have conducted talks about allowing Russia to develop and enlarge its naval base, so that Russia can strengthen its naval presence in the Mediterranean.[4] Amid Russia's deteriorating relations with the West, because of the 2008 South Ossetia War and plans to deploy a US missile defense shield in Poland, President Assad agreed to the port’s conversion into a permanent Middle East base for Russia’s nuclear-armed warships.[5] Since 2009, Russia has been renovating the Tartus naval base and dredging the port to allow access for its larger naval vessels.[6]
Syria for the past few years has reached out to Russia to obtain modern weapons that included many modern anti-tank and anti-air missile systems that will further improve its combat capabilities. In 2008, Syria agreed to purchase MiG-29SMT fighters, Pantsir S1E air-defense systems, Iskander tactical missile systems, Yak-130 aircraft, and two Amur-1650 submarines from Russia. Russia's foreign minister said his country's sale of weapons to Syria would not upset the balance of power in the Middle East. The sales he stated are "in line with the international law" and "in the interests of strengthening stability and maintaining security" in regions close to Russian borders, Sergei Lavrov told reporters during a visit to the United Nations in New York.[7] As of 2011, Syria's arms contracts with Russia were worth at least $4 billion.[8][9] Dmitri Trenin reports in the New York Times that from 2000 to 2010 Russia sold around $1.5 billion worth of arms to Syria, making Damascus Moscow’s seventh-largest client.[10]
Economic relations
Russia has significant trade relations with Syria. Its exports to Syria were worth $1.1 billion in 2010 and its investments in the country were valued at $19.4 billion in 2009 according to The Moscow Times.[11][12] Besides lucrative arms contracts worth at least $4 billion, Russian firms have a substantial presence in Syria's infrastructure, energy and tourism industries.[8] Stroitransgaz, a natural gas facility construction company, has the largest Russian operation in Syria. In 2010, it was involved in projects worth $1.1 billion and had a staff of 80 Russians working in Syria. Stroitransgaz is building a natural gas processing plant 200 kilometers east of Homs in the Al-Raqqa region and is involved in technical support for the construction of the Arab Gas Pipeline. Tatneft is the most significant Russian energy firm in Syria. The company began in 2010 through a joint venture with the Syrian national oil company to pump Syrian oil and it planned to spend $12 million on exploratory wells near the Iraqi border.[11] Other firms with large business interests in Syria include steel pipe manufacturer TMK, gas producer ITERA, and national carrier Aeroflot.[8]
http://en.wikipedia.org/wiki/Russia%E2%80%93Syria_relations
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