Which term describes SALT, the Helsinki Accords, and meetings between the United

Detente is your best answer.

Explanation:

Detente, or "the easing of hostile relations between nations" was what occurred during both the SALT I & II treaties, which aimed at reducing the amount of ready-armed nuclear warheads from both countries, and to instead build up relationships between the two nations that was not harrowed in the thought of nuclear warfare.