"Let's be frank - we won't be able to do this (to join NATO - ed.) in a year. We must carry out a number of reforms in order to meet NATO standards in terms of defense capability, and the standards of providing for the Ukrainian army, and many other things," he said.
Razumkov noted that the North Atlantic Alliance is not only a defense bloc, but also a humanitarian one.
"I am sure that we will achieve this goal, but this path will not be easy, and to say that it will be short is wrong ... 10 years is theoretically possible. I try not to promise in what I am not sure about," he added.
Meanwhile, the Kremlin is concerned about talks on a possible plan for Ukraine to join NATO and says Ukraine's membership in the North Atlantic Treaty Organization will be a "red line".
"This is something we are watching very closely, and this really is a red line for us - as regards the prospect of Ukraine joining NATO," Peskov told the Ekho Moskvy radio station.