Nato boss Jens Stoltenberg says Ukraine's membership pathway will be changed from a two-step process to a one-step process.

"This is a strong package for Ukraine and a clear path towards its membership in Nato," he insists.

His comments came after President Zelensky said it was "unprecedented and absurd" not to have a timeframe for Ukraine's membership.

Membership can take decades to achieve - but Ukraine has asked for a much quicker timeline.

Nato offers collective security, as countries are obliged to defend fellow members that come under attack.