By Andrew Hay and Rod Nickel (Reuters) – A Texas software developer and a cook in British Columbia are among dozens of Americans and Canadians answering Ukraine’s call for foreign volunteers to fight Russia’s invasion. With their governments refusing to send troops to Ukraine out of fear of sparking a world war, Americans and Canadians told Reuters they were inspired by Ukrainians’ fierce resistance. Many believe their democratic rights will be threatened at home if they do nothing to defend Europe. Ukrainian President Volodymyr Zelenskiy called on Sunday for the formation of an “international…