I have delayed posting my own thoughts, so I’m substituting those of Kaiser Wilhelm II. for now.
The first item is an interview published in the Daily Telegraph in October 1908. You wouldn’t realize it from reading it, but it actually was supposed to be some kind of olive branch towards the British.
The second item are the “Willy-Nicky” letters the Kaiser and the Russian Czar Nicholas II. exchanged over the decades. Being cousins they indeed addressed each as “Willy” and “Nicky”, respectively. The link only leads to Wilhelm’s side of the correspondence. The letters were found after the Czar’s execution by the Soviets.
Interesting to note is that “Willy” and “Nicky” kept corresponding until March 1914. Wilhelm had tried to maintain cordial relations with his cousin to the last, in the hope of keeping Russia from going to war with Germany after all.
As noted at the site, interpretations of the letters are very different – some claimed that the Kaiser had lured the Czar into the disastrous war with Japan in 1905, others that he had planned an European conflagration decades, while yet others saw him as a unsuccessful peacemaker.