Children who fled Ukraine play before the beginning of "Classroom for Ukraine", a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner TPX IMAGES OF THE DAY 

Kamila, a child who fled Ukraine attends "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

A school book for children who fled Ukraine is seen inside "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

Kamila, a child who fled Ukraine reacts as she attends "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

Sergey, a child who fled Ukraine waits for the beginning of "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

Children who fled Ukraine attend "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

A painting made by a child who fled Ukraine is seen inside "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

Children who fled Ukraine attend "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

Children who fled Ukraine attend "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

Kamila and Sophia, children who fled Ukraine attend "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

A child who fled Ukraine arrives for "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

Paulina, a child who fled Ukraine plays before the beginning of "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

Paintings made by children who fled Ukraine are seen inside "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

A child who fled Ukraine attends "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner 

Sophia, a child who fled Ukraine attends "Classroom for Ukraine" a school project launched by Arche as Russia's invasion of Ukraine continues in Berlin, Germany, March 31, 2022. REUTERS/Lisi Niesner