Aides Say Carter Is Courted by Russians
Carter aides say Soviet Embassy has expressed interest in Pres race and may pursue policies that may influence outcome; say Soviet diplomats assert that Ford is undermining detente, that they oppose Jackson and that they have suggested meeting between Carter and Amb Dobrynin; say Carter orgn has also been contacted by Brit and French diplomats, although never by Chinese; other candidates rept no such contacts (M)