MOSCOW : Economic Summitry

The prime ministers of the 11 member countries of the Commonwealth of Independent States are to meet Friday in Moscow to address some of the crucial economic issues afflicting the loose new grouping. Among the issues are the customs policy for the newly created borders that exist among the former Soviet republics; tax coordination and pension guarantees.

The Commonwealth presidents are scheduled to meet one week later to take another stab at dividing up the Soviet Army and working out a joint military policy that would suit all 11 countries.

All the members of the former Soviet Union have now joined the Commonwealth except for the three Baltic nations--Latvia, Lithuania and Estonia--and Georgia.