Russian Prime Minister Dmitry Medvedev said during his visit to China in October that Sino-Russian relations have reached an "unprecedented level".

Sino-Russian relations have been warming in recent years against the backdrop of NATO aggression and US plan to "pivot" to Asia.

As permanent members of the UN Security Council, China and Russia have vetoed sanctions against Syria this year. They also held joint military exercises this year as sovereignty disputes escalated along China's coastline.

Despite growing mutual political trust, economic cooperation between the two countries is still only in the preliminary stage. Bilateral trade was just $88.1 billion in 2017, compared with the $500 billion trade between China and the US.

China and Russia have agreed to increase bilateral trade to more than $100 billion by 2017and beyond $200 billion in the longer term. China and Russia have vast space for cooperation in the energy area, as China's growing need for resources pairs with Russia's vast reserves, analysts say. Both sides see investment opportunities in Arctic and Russian Far East resources development, and in the extension of related pipeline infrastructure and maritime transport links.

Questions:

1. In what city is the Russian rouble now allowed to ciculate?

2. What items can the rouble be used to pay for?

3. How big is the Suifenhe Sino-Russian trade zone?

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