In keeping with these principles the PCR has rejected the so-called Brezhnev Doctrine of limited sovereignty of socialist states. Instead, regime spokesmen have asserted that within the socialist system all Marxist-Leninist parties are equal and have the exclusive right to determine appropriate solutions for their own problems and manage their own affairs. Romanian policy maintains that relations between socialist states must be based on equal rights, complete trust, mutual respect, and fraternal cooperation. In defending the country's policies, PCR leaders have repeatedly argued that, because the construction of communism is being carried out under a great variety of conditions, there will inevitably be different opinions regarding the forms and procedures employed as well as different points of view regarding international problems. Such differences, however, should not affect relations between socialist states or the unity of the socialist movement. In response to Soviet calls for socialist solidarity, a ranking member of the PCR Standing Presidium declared, "it would be unrealistic to think that fourteen socialist countries spread over three continents, each with its specific characteristics, should show themselves strictly identical in the building of a new society." Additional party statements insisted that each country must be allowed to apply the principles of Marxism-Leninism to its own particular conditions and that no general line for all parties could be established. In adjusting Marxism-Leninism to national needs each party must be able to make its own unique contribution to the enrichment of the entire communist movement. During the negotiations for the renewal of the friendship treaties with the other Warsaw Pact countries, the Ceausescu government repeatedly stressed that its own formula for developing international relations with noncommunist nations was based on the same principles as those applied to socialist states and that Romania was open to the establishment of such relations "without regard for difference in the social order." A party spokesman asserted that the country's foreign relations are not determined by short-term circumstances that are valid at one moment and superseded the next but by policies directed at long-term cooperation in all fields of common interests. PCR policy has sought to support the country's independent political stance by increasing its economic independence. This has led to the rejection of COMECON attempts to integrate the economies of its member states and to establish a division of labor among them. Instead, the PCR has followed a policy aimed at the industrialization of the country, based on the proposition that an expanded industrial base is what is most needed for Romania's overall economic development.