The Biden administration is under increasing pressure to permit Ukraine to launch attacks against Russia using American missiles.

On Tuesday, President Biden admitted that his administration is considering lifting the ban on Ukraine using U.S. weapons to strike deep inside Russia.

He stated that they were currently determining whether to permit Ukraine to utilize the long-range Army Tactical Missile System, or ATACMS, to target Russian sites when questioned by reporters.

Support for lifting the ban has come from all sides.

This week, a group of high-level House Republicans wrote to the president, stating that the restrictions have hindered Ukraine's ability to defeat Russia's aggression and have given the Kremlin's forces a safe haven to attack Ukraine without consequences.

Several committee leaders, including House Foreign Affairs Committee Chair Michael McCaul, House Intelligence Committee Chair Michael Turner, House Armed Services Committee Chair Mike Rogers, signed the House GOP letter.

The Biden administration is criticized, while top Republicans such as Donald Trump propose a diplomatic resolution to the conflict.

A letter signed by a group of former high-level national security officials from both the U.S. and U.K. urged the two countries to permit the use of their weapons without restrictions against Russian territory on Wednesday.

The bipartisan group of House and Senate members wrote another letter stating that the ban allows Russia to concentrate more on its offensive operations instead of defending itself.

"Allowing Ukraine to strike all legitimate targets in Russia with the Western weapons it has received will not cause Moscow to escalate," they wrote. "We urge you to listen to your partners in Kyiv this week and allow Ukraine to defend itself."

Ukrainian President Volodymyr Zelensky has urged U.S. officials to lift the ban they imposed to prevent U.S. involvement in the war. Recently, Washington has partially lifted the ban, allowing Ukraine to use U.S. weapons for defensive strikes within its own territory.

On Wednesday, U.S. Secretary of State Antony Blinken and British Foreign Secretary David Lammy traveled to Kyiv to gather information on how long-range strikes would factor into Ukraine's broader battlefield strategy. The U.K. is also considering whether to allow Ukraine to strike deeper inside Russia with its own long-range system, the Storm Shadow.

Blinken did not indicate any change in policy regarding the "green light" to target inside Russia on Thursday, and instead restated a desire to continue adapting to Russia's aggression.

Blinken anticipates that Biden and U.K. Prime Minister Starmer will discuss the topic during their meeting in Washington on Friday.

This week, Defense Secretary Lloyd Austin rejected the idea that easing restrictions and enabling Ukraine to advance further into Russia would shift the course of the conflict.

"No single skill will determine the outcome of this campaign."

"Obviously, Russia has many targets, being a large country," Austin stated during a meeting of the Ukraine Defense Contact Group in Germany on Friday. "Ukraine possesses significant capabilities, including unmanned aerial vehicles, to tackle those targets."

The ongoing debate about lifting restrictions coincides with the concerning transfer of Iranian ballistic missiles to Russia.

There are concerns that the U.S. may not have enough ATACMS to offer Ukraine without compromising its own readiness, and that using the weapons to strike deep into Russia could deplete their supply for other parts of the military campaign, such as inside Crimea. However, proponents of lifting the ban argue that Ukraine is already using ATACMS on territory that Russia considers its own, in Crimea.