- Estonia's president said Ukraine joining NATO is "non-negotiable" and "irreversible."
- NATO must send a strong message that it will support Ukraine for as long as it takes, Alar Karis said.
- Trump is reportedly open to a deal with Russia that would block Ukraine from the alliance.
Estonian President Alar Karis said Ukraine joining NATO isn't negotiable and that the Western military alliance must send a strong message that NATO will support Ukraine for as long as it takes.