Up to 10% of Ukrainian soldiers are thought to be from the LGBTQ+ community. While tolerance is improving, Ukraine still does not guarantee legal equality.
Maybe not, ostensibly if you're persecuted you could seek asylum and you're probably a lot less likely to be killed overall.
I defs wouldn't give my life to defend people that don't respect me. Conscription is a crime against humanity at the best of times but conscripting people without full rights is straight up evil.