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Military experts believe that the US policy prohibiting Ukraine from using American weaponry to attack targets inside Russia is giving the invader an as it develops its recent offensive in the northern Kharkiv region.

The latest offensive began on May 10, but Kharkiv itself – Ukraine’s second-largest city – has come under daily missile attack since the full-scale war began in February 2022.

The city of about 1.4 million people, now crowded with refugees from the surrounding towns and villages, has become something of a symbol of continuing Ukrainian resistance.

Being able to use the powerful, long-range weapons supplied by its western allies would allow Ukraine to strike at targets across the border in Russia. This would help Kyiv’s military planners shape the wider battlefield in their favour. As it stands, Russia can in relative safety as its key infrastructure, such as air bases and supply depots, lie just across the border.

Washington has always been adamant that Ukraine mustn’t use its weapons to target Russia. But that the State Department is pushing for a change in light of the fresh offensive in the Kharkiv region.

On a visit to Kyiv on May 15, US secretary of state, Antony Blinken, implied that the time might be right to allow Ukraine to use to strike at targets across the border, saying: “We have not encouraged or enabled strikes outside of Ukraine, but ultimately Ukraine has to make decisions for itself about how it’s going to conduct this war.”

There has been no official policy shift, but the removal of this limitation on Kyiv’s use of US weapons systems would mark a significant moment in the conflict. Despite all the setbacks of the past year, Kyiv has largely adhered to this rule, mindful that serious violations could curb foreign support.

Several of Ukraine’s allies have given the green light for Kyiv to use their weapon systems within Russian territory. The UK foreign secretary, David Cameron, during a visit to Kyiv that Ukraine “absolutely has the right to strike back at Russia.” It appears that France is .

Ukraine has already conducted strikes deep within Russia using its own weapons, including basic drones, which have significantly hampered Russian and even . But it has limited resources. Using western-made systems would allow Ukraine to increase the tempo of these attacks, potentially limiting Russia’s ability to commit to offensives.

Strikes by Ukraine have already begun to . If US weapons systems were approved for use against targets in Russia, then the Russian interior would no longer be safe. Importantly, it could force Moscow to pull Russian air defence and strike aircraft away from the frontlines to defend critical infrastructure.

Still, a potential expansion of how this aid can be used, including striking targets within Russia, raises several important considerations.

Ultimately, allowing Ukraine to use western weapons against targets in Russia is not guaranteed to shift the overall strategic balance greatly. It will disrupt Russian supply lines, command structures and logistical hubs, thereby reducing the effectiveness of Russian military operations in Ukraine. But it will not fundamentally alter the balance of power.

Weapons such as the high mobility artillery rocket systems (Himars) enough, but they are unlikely to alter the essential arithmetic at play in what has become a . Successive mobilisations have seen Russian forces since the war’s outset. These raw numbers are difficult for Ukraine to match.

Ukraine with recruitment and its economy is flagging. Unless Kyiv and its allies can fundamentally shift the character of this conflict, the outlook is not good. At present, Putin is content to Ukrainian resistance and wait for western backing to diminish.

In this regard, the upcoming US election will be a key moment. Another could see Washington refocus on domestic issues, perhaps even cutting the supply of military aid.

Potential for escalation

But the use of western weapons to strike Russian territory would have significant geopolitical implications. It could lead to increased tensions between Russia and the Nato countries supplying the weapons. The risk of escalation, including the possibility of Russia retaliating against Nato members, is a serious concern, particularly given Vladimir Putin’s repeated use of nuclear threats aimed to stoke western fears.

The potential for miscalculation and unintended consequences cannot be overlooked. Striking Russian territory could provoke a strong and possibly unpredictable response from Russia. The Kremlin’s , while often considered bluster, cannot be entirely dismissed, especially if they choose perceive direct attacks on their homeland as an existential threat. Russian military doctrine if this is the case.

The debate over whether to permit Ukrainian use of western military aid to strike Russian territory involves a complex interplay of military strategy and geopolitical considerations. While such a move could provide significant tactical advantages to Ukraine, it will not fundamentally alter the overall strategic picture. It also carries substantial risks that must be carefully weighed.

The evolving nature of this conflict requires continuous assessment and a cautious approach to ensure that the actions taken contribute to a sustainable and just resolution without escalating into a broader, more devastating war.

, Teaching Fellow, School of Strategy, Marketing and Innovation,

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