1. This is a famous saying of the old czar Alexander II. There was no air force at that time.

2. This sentence means that all allies are unreliable, and only their own strength (strength) is the most reliable.

3. Putin adopted Alexander II's sentence, which means that Russia should strengthen the construction of national defense and confront the military threat of NATO. Especially in Afghanistan and Central Asia, the United States deployed a theater missile defense system in Poland. When NATO entered Russia's doorstep, Russia should strengthen the new military revolution and not fall behind the times.