You can register .ro domains and every Romanian extension (.com.ro, .info.ro, .org.ro, .store.ro and more), plus international ones such as .com, .net, .org, .e...
Yes. You can create multiple A records for the same name with different IPv4 addresses, or multiple AAAA records for IPv6 addresses. This setup can help distribute traffic, but it does not guarantee an even split or automatic failover to a working server if another one goes down.
Before adding the addresses, check that each server can serve the domain correctly, including over HTTPS, and that the website and any necessary data are synchronised. Do not simply add an old hosting IP alongside the new one: some visitors could end up seeing the old version of your website.