Biden authorizes Ukraine to use US-supplied arms inside Russia

President Biden has allowed Ukraine to use American weapons to strike Russian targets near Harkiv, with specific restrictions. These weapons can only be used against Russian forces attacking or preparing to attack Ukrainian positions. Germany has also granted similar permissions for its supplied weapons, emphasizing Ukraine's right to self-defense.

What additional support did Germany provide to Ukraine regarding weapon usage?

What right does Ukraine have in response to attacks on Harkiv?