(CNN) Russian President Vladimir Putin, for the second time this week, floated the possibility that Russia may formally change its military doctrine of not being the first to use nuclear weapons in a conflict, days after he warned of the "increasing" threat of nuclear war.
"They (the US) have it in their strategy, in the documents it is spelled out -- a preventive blow.
We, on the other hand, have formulated a retaliatory strike in our strategy," Putin said at a news conference in the Kyrgyzstan capital Bishkek.
Putin said that United States' policy was not to exclude the possibility of "disarming" nuclear strike, while Russia's doctrine is to use nuclear weapons as the last resort.
No one was shy when they talked about it out loud in previous times and years," he said.