Syria imported nearly six times more weapons from 2007 to 2011 than during the previous five years, and Russia accounted for 72 percent of the arms to the Syrian government, an international research institute said Monday, the Associated Press reported.

The report by the Stockholm International Peace Research Institute highlighted how Moscow continues to provide Syria with weapons while the European Union and US maintain an arms embargo.

However, it did not specify the volume of weapons exported after the start of the uprising in 2011.

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SIPRI researcher Pieter Wezeman said the arms delivered from 2007 to 2011 included air defense systems and anti-ship missiles, which have no direct use in the current conflict. But Wezeman said they have upgraded the government's military capabilities.

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The United Nations estimates more than 8,000 people have been killed as a result of the violence in Syria.

The report showed the US is the No. 1 weapons exporter while on the flip side - India, South Korea, Pakistan, China and Singapore - were the five largest arms buyers.

CNN reported fresh explosions on Monday in Damascus and other cities around Syria, according to opposition activists.