One option that could have been explored was for the European nations to form a united front and present a unified diplomatic voice to Germany. This could have included a joint statement of solidarity and a commitment to working together to peacefully resolve the tension between Germany and the rest of the world.
Another potential solution could have been to propose a series of international meetings and conferences between the countries of Europe, Germany, and other relevant parties. This could have provided a platform for dialogue and a means to ease the tension between Germany and the rest of the world.
By taking any of the above steps, Europe could have helped to reduce the tension between Germany and the rest of the world, providing a more peaceful resolution to the conflict.
Hope this helped! Have a nice day. :)