As I understand it, вы-words are used to show respect. They're used when speaking to elders, teachers, officials, and so on. I understand that ты-words are used when speaking to friends, family, animals, and people who are deemed disreputable. So why do Russians use ты-words in their national anthem (Государственный гимн Российской Федерации) to address Russia? I'd think they'd use respectful language to the country they're proud of.
Here are some examples:
"Твоё достоянье на все времена!"
"Славься, страна! Мы гордимся тобой!"
"Одна ты на свете!"