A number of Western countries allow Ukraine to use supplied weapons to defend itself by attacking Russian territory.
However, it is specified that this is not a blank check and usage of weaponry should be limited to counterattack actions.
Spain and Italy, among others, do not permit the use of their weapons on Russian ground.
Fears exist of the risk that weapon usage triggers Russian retaliations and directly involves NATO in the conflict.
President Putin warns of grave consequences, including the veiled threat of nuclear reprisals.
Conclusion: The authorization of using weapons on Russian territory is a delicate, potentially escalating political decision posing both the prospect of a more effective defense of Ukraine and the risk of a harsh and disproportional response from Russia.