"The perception is that somebody would try to undermine Russia as a country that opposes the United States, and then we will need to defend ourselves by military means," he explained.
Source: http://www.vox.com/2015/6/29/8845913/russia-war
I am not sure in what sense the auxiliary verb "would" is used in the sentence above. Does it indicate the repeated action in the past (similar to "used to")? From the context I would deduce more likely that the attempts to undermine Russia are situated in the presence .