(Clarifies paragraph 11 in JUNE 6 article to show some participants learnt how to set up camp, while others also learnt other defence skills) By Essi Lehto HATTULA, Finland (Reuters) -Just days after Russia attacked Ukraine on Feb. 24, Finnish entrepreneur Sissi Moberg found herself scouring the internet for courses that could teach her skills to help defend Finland in case of a military attack. “I felt very sad for the Ukrainians. And then I started to worry about Finland and thinking what could I do about this,” the 46-year-old mother-of-four told Reuters. Within weeks, Moberg was on a cours…