At the same time, nearly 7 million Ukrainians left the country. It means a lack of taxes and reserves for the army, he said in the interview for ARD.
From: Euromaiden Press BY ORYSIA HRUDKA

Speaking with a journalist from the German TV channel ARD in Kyiv, Zelenskyy said Ukraine has almost a 1-million-strong army. At the same time, only 30 million Ukrainians are living in Ukraine and paying taxes, down from the pre-war level of at least 37 million.
Answering the question about the new mobilization law, Zelenskyy said it is first of all about justice. The army needs additional recruits to ensure the rotation of those who have been fighting since the first days of the war.
“In the issue of mobilization, the moment of demobilization is important. Many people fought for many days. There are people who have been on the battlefield for 700 days. I am grateful to them for protecting our state, like every Ukrainian. Gratitude is not enough from society. I think we need fair rotations. We need to give extended vacations. Money cannot cover everything. Although wages are high, but, nevertheless, justice is needed in this direction. I expect the law on fair mobilization from the military,” Zelenskyy said.