Nearly three-dozen deals worth more than $5.5 billion combined are expected to be signed between China and Russia during Prime Minister Vladimir Putin's visit to Beijing, possibly including a major refinery in Tianjin.

The Sino-Russian contracts involve a range of industries, from energy, transportation, mining, to finance and telecom.

Chinese observers hailed the deepening economic bonds between the two countries, which formed an economic partnership in 1996.

"China and Russia are strategic cooperative partners and the partnership in many aspects, particularly in economy, has reached high levels in recent years," said Yu Sui, researcher with the Beijing-based Research Center of Contemporary World.

The slew of contracts comes after it was reported that China is expected to sign a gas deal with the world's top gas exporter.

Gazprom, the world's largest producer of natural gas, was expected to sign a supplement agreement on energy with China National Petroleum Corporation to increase natural gas exports to China.

The trade volume between the two countries soared to $56.83 billion in 2008 from $9.3 billion in 2002, a six-fold increase in six years.