How did the Soviets hamper Eastern Europe's economic recovery after World War 2?

Currancy,they contolled the exchange rate between the Ruble (which was kept artificially high)and Eastern Europian currencies(kept artificially low).American Western Europian and Japanese currency were good anywhere they were called hard currency,Soviet and Eastern Europian currancy were called soft currancy only good in Eastern Europe and the Soviet Union. The result was Communist contries could only trade with each other unless they could sell somthing to the West for hard currency and use that money to buy somthing from the West or they could do a barter deal. In the end the Eastern Europian countries under Soviet domination had little to no access to world capitol investment their industries became obsolete and their econimies stagnated.