KYIV, Ukraine (AP) — Ukraine’s president is ordering a full military mobilization to challenge the Russian invasion.

President Volodymyr Zelenskyy issued a decree Thursday evening saying the mobilization would last 90 days.

He ordered the military’s General Staff to determine the number of those liable for service and reservists as well as the order of the call-up.

Zelensky gave his Cabinet the job of allocating funds to pay for the mobilization.

Zelenskyy says 137 civilians and military personnel have been killed so far in the Russian invasion of his country.

He calls them “heroes” in a video address released early Friday in which he also says hundreds more have been wounded.

Zelenskyy says that despite Russia’s claim it is attacking only military targets, civilian sites also have been struck. In his words: “They’re killing people and turning peaceful cities into military targets. It’s foul and will never be forgiven.”

The president says all border guards on Zmiinyi island in the Odesa region were killed Thursday. Ukraine’s border guard service earlier in the day reported that the island was taken by the Russians.