As Putin explained possible changes in the nuclear doctrine of the Russian Federation:

As Putin explained possible changes in the nuclear doctrine of the Russian Federation: “In the West they are developing nuclear weapons of extremely low power and we know that in their expert circles in the West, there is an idea that such nuclear weapons can be used and there is nothing terrible about it. It can be not terrible, but we must react to this and we are reacting. My statements that we are reviewing our strategy are connected with this.“ Source: Victor vicktop55