I recently worked on a large reformer for Russia. We agreed with the client to do all stress calcs with Caesar II to B31.3 code. In order to comply with Russian authorities, our work was repeated in Russia by a local 'technical institute' using their software to GOST codes. So far as I am aware there were no surprises and no over-stress problems found in Russia having previously been passed by us. Conclusion .... CAESAR II to B31.3 will probably satisfy the GOST codes.