Memorandum summarizing consultations between the Stasi and KGB over RYAN (Raketno-Yadernoe Napadenie, or “nuclear weapon attack”), an intelligence program initiated by the KGB to collect indicators of a potential nuclear first-strike by the US. The KGB had developed a new system for the early detection of war preparations for a first-strike attack, which should provide evidence of such preparations on the basis of “objective” indicators that would be hard to manipulate.