Ukrainian President Volodymyr Zelenskyy on Thursday welcomed the support of allies who pledged new military aid and a path to NATO membership, but he urged them to expedite the process and lift restrictions on the use of U.S. weapons against military targets inside Russia.

“If we want to win, if we want to prevail, if we want to save our country and to defend it, we need to lift all the limitations,” Zelenskyy said alongside NATO Secretary-General Jens Stoltenberg at the end of the summit.

The summit occurred during a turbulent period in American politics, with Democrats increasingly concerned about President Joe Biden’s ability to serve another term after a disappointing debate performance two weeks ago.

A verbal misstep by Biden on Thursday evening further fueled those concerns. At an event announcing an agreement called the Ukraine Compact, Biden mistakenly introduced Zelenskyy as Russian President Vladimir Putin.

Several people in the audience gasped at Biden’s error, which he quickly attempted to correct. “President Putin? You’re going to beat President Putin,” Biden said to Zelenskyy. “I’m so focused on beating Putin, we got to worry about it.”

British Prime Minister Keir Starmer and French President Emmanuel Macron declined to criticize Biden. Macron said “we can all have a slip of the tongue” and that Biden, with whom he spoke during Wednesday’s dinner, “is very much on top of things.” Starmer refused to directly address Biden’s gaffe multiple times, instead praising Biden’s leadership and preparation for the event, highlighting his success in securing positive outcomes for Ukraine.

All eyes were on Biden as he concluded the summit of 32 NATO leaders in Washington with a press conference.

When asked about Zelenskyy’s request for greater freedom to target Russian forces, Biden showed no indication of easing U.S. restrictions, stating that he was following the advice of his defense and intelligence officials.

“If he had the capacity to strike Moscow, strike the Kremlin, would that make sense?” Biden said of Zelenskyy. He later added, “We’re making it on a day-to-day basis … how far they should go in” to Russian territory.

Ukraine has been the central focus for European and North American leaders at the summit of the 75-year-old military alliance. Earlier in the day, Biden announced a new military aid package, pledging to Zelenskyy: “We will stay with you, period.”

While Zelenskyy expressed gratitude for the package and the promise by NATO leaders that Ukraine is now on an “irreversible path” to membership in the military alliance, he also raised a concern: Ukraine cannot win the war with Russia, now in its third year, unless the U.S. ends limits on the use of its weapons against Russia.

The Biden administration permits Ukraine to use weapons within Russian territory only to retaliate against Russian forces attacking or preparing to attack them, out of concern that broader use of American-made weaponry could provoke Russia to escalate the war.

Zelenskyy has been advocating for greater freedom to utilize U.S. weapons to strike critical military bases and installations deeper within Russian territory.

Calls to drop the restrictions have intensified in recent months, following Russian military gains during a period in which political battles in the U.S. delayed crucial military support for Ukraine.

Stoltenberg and Macron have supported Ukraine’s efforts to gain more flexibility in how it uses U.S.-provided arms. If we tell Ukrainians “you do not have the right to reach the point from which the missiles are fired, we are in fact telling them that we are delivering weapons to you, but you cannot defend yourself,” Macron said in May.

In a private meeting with Zelenskyy, Biden highlighted the aid package as his eighth since taking office. This latest package includes $225 million in support, including an additional Patriot missile system to enhance Ukraine’s air defenses against a wave of deadly Russian airstrikes.

The Patriot air defense system, the second provided by the U.S. to Ukraine, is one of several announced this week. It is part of a surge in pledges to deliver weapons to Ukraine to aid in its defense against Russian attacks, including one of the deadliest attacks of the war this week that targeted a children’s hospital in Kyiv.

The devastating missile attack on the eve of the summit commemorating NATO’s 75th anniversary underscored that Putin may not be ready for peace anytime soon.

Commenting on NATO allies’ declaration that Ukraine is on an “irreversible” path to membership, Dmitry Medvedev, deputy head of Russia’s Security Council, which is chaired by Putin, said Moscow should do everything to “make this irreversible path of Ukraine to NATO lead to the disappearance of either Ukraine or NATO, or better both.”

While promising that Ukraine will eventually become a member of the alliance, NATO leaders have stated that it can only join after the war with Russia and when allies agree that it has met all necessary conditions.

In addition to offering increased military support, NATO launched a new program to underwrite deliveries of military equipment and coordinate training for Ukraine’s beleaguered armed forces. NATO members also committed to maintaining current levels of military aid — approximately $43.5 billion annually — for at least a year.

The summit has also been overshadowed by concerns about growing Chinese and North Korean support for Russia’s invasion.

The flurry of final events at the NATO summit follows a day in which NATO labeled China a “decisive enabler” of Russia’s war against Ukraine. China, in response, accused NATO of seeking security at the expense of others and warned the Western military alliance against bringing the same “chaos” to Asia.