Zelensky's European tour comes at a critical time for Ukrainian troops, who are facing an incredibly difficult situation on the eastern frontlines because of ammunition shortages.
NATO countries last year reiterated a long-standing position that Kyiv will one day become a member of the US-led military alliance, but did not set a clear timeframe.
Military Intelligence said the special operation used Ukraine's own MAGURA V5 maritime drones to sink the Russian amphibious assault ship Cesar Kunikov in the Black Sea in the pre-dawn attack.