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The new space agreement between Russia and the U.S. opens the door for affordable joint biomedical tests using the proven and versatile Russian space station MIR . Those applicants selected for this program must complete the Voluntary Emeritus Work Agreement ( Appendix J , Operating Procedures ) . In the case of North Korea , the United States would have to replace the U.S. nuclear umbrella over South Korea with some form of regional Korean peninsula nuclear free zone agreement . This program is authorized through a Limited Authorities Agreement between the DEC and USFWS . In discussions on this issue , there was a broad agreement about the value of and growing interest in NWFZs .