"The most difficult task now is to fill this memorandum with the necessary content," the official noted ST. PETERSBURG, May 20. /TASS/. Drafting a memorandum with Ukraine about a future peace treaty will take a lot of time, Russian Security Council Deputy Chairman Dmitry Medvedev said. "As for the memorandum, this idea has been formulated, but it is still a long way to go before the memorandum will be filled with content that will be adequate to the problem. To find an appropriate or proper