Presidents Joe Biden and Volodymyr Zelensky will discuss the possibility of the United States providing Ukraine with long-range missiles that the Biden administration has chosen not to give the country to date.

The Biden administration has repeatedly denied Ukraine's request for Army Tactical Missile Systems due to concerns that Russia could view that as an escalation if it enables Ukraine to strike targets within Russian territory. Despite the stance Biden has held for months, he has on multiple occasions changed his mind after previously declining to provide Ukraine with other weapons.

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“President Biden will continue to discuss that issue with President Zelensky today. He has said he’s been looking at it and will continue to do so,” national security adviser Jake Sullivan said on Good Morning America on Wednesday.

Sullivan's remarks came ahead of Biden's meeting with Zelensky, both of whom are in Vilnius, Lithuania, for the NATO summit.

While NATO leaders opted not to invite Ukraine to join them in the alliance, they promised to remain committed to assisting the country in the short and long term even though they offered no specific timeline or conditions regarding Ukraine's path toward membership in the future.

“It’s unprecedented and absurd when [a] time frame is not set, neither for the invitation nor for Ukraine's membership,” Zelensky tweeted. “While at the same time vague wording about ‘conditions’ is added even for inviting Ukraine. It seems there is no readiness neither to invite Ukraine to NATO nor to make it a member of the Alliance.”

Should Ukraine join the alliance while the war is occurring, it would bring NATO and Russia into direct conflict due to the alliance's Article 5 obligation to respond to an attack against any member as though it was against them all.

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Biden had previously declined Ukrainian requests for tanks, the Patriot missile defense system, and aircraft while later deciding the situation called for a reversal of those stances. The president agreed in May to support a coalition of countries that decided to train Ukrainian pilots on F-16 fighter jets with the intent of getting them to Ukraine in the future.

Sullivan said the training has begun but will take "some time" and that he anticipates European countries with excess F-16s will likely be the countries providing them to Ukraine.