S. Popov: The situation was likely very similar to what went on in the case of nuclear weapons development, with the two sides both working intensively to build up their nuclear capacity, without wanting to get into a nuclear conflict. And as Thatcher said, that policy bolstered the peace. It's of course possible to entertain significant doubts about that position, but I do think that there is no question but that there was a certain deterrent factor in play.