Country's activists remain defiant as they mark war's first anniversary
Co-founder of group who fled Kyiv among speakers
Helen Globa arrived in New York on March 6
Supporters seek closer ties to EU
Activist suffered concussion, facial injuries during Aug. 31 incident
Nationalists sought to disrupt Kiev event
Kiev police reportedly refused to protect advocates
Mother, gay son meet U.S. lawmakers, White House during advocacy trip
Crowds, sanitation concerns prompt move to larger space
