there was also scientific cooperation (from wiki on Venus)
> A suite of instruments more sensitive than those on Mariner 2, in particular its radio occultation experiment, returned data on the composition, pressure and density of the Venusian atmosphere.[102] The joint Venera 4 – Mariner 5 data were analyzed by a combined Soviet-American science team in a series of colloquia over the following year,[103] in an early example of space cooperation.[104]
> A suite of instruments more sensitive than those on Mariner 2, in particular its radio occultation experiment, returned data on the composition, pressure and density of the Venusian atmosphere.[102] The joint Venera 4 – Mariner 5 data were analyzed by a combined Soviet-American science team in a series of colloquia over the following year,[103] in an early example of space cooperation.[104]