What would Bismarck or Frederick the Great have thought?

Donald Trump, in an interview banned by YouTube yesterday (because he repeated that the 2016 election was rigged I suppose) said when asked what he thought would happen in Ukraine, 

"We are playing right into their (Russia’s) hands. Green energy. The windmills don’t work. They’re too expensive. They kill all the birds. They ruin your landscapes. And yet the environmentalists love the windmills. And I’ve been preaching this for years. The windmills – and I had them way down – are the most expensive energy you can have. And they don’t work."

So he chose not to answer the question, but he does have a point. Merkel made Germany dependent on Russia. What would Bismarck or Frederick the Great have thought?