An original line from Stratfor's Decade Forecast: 2015-2025, published in February:
The world has been restructuring itself since 2008, when Russia invaded Georgia and the subprime financial crisis struck. Three patterns have emerged. First, the European Union entered a crisis that it could not solve and that has increased in intensity. We predict that the European Union will never return to its previous unity, and if it survives it will operate in a more limited and fragmented way in the next decade.
Why is simple past used first, and then present perfect but not simple past again? It seems to break grammar conventions for consistency of tense.