Vilnius: After President Volodymyr Zelensky's hopes for a clear timeline for joining the alliance were dashed by NATO, Western powers will propose long-term security commitments for Ukraine on Wednesday.

A day after criticising them for taking too long to bring Ukraine into the fold, Zelensky will hold symbolic talks with the 31 leaders of NATO at their summit in Vilnius, the capital of Lithuania.

The G7 nations are anticipated to make a statement outlining how they will support Kyiv in defeating Russia and thwarting future aggression in an effort to reassure the Ukrainian president.

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British Prime Minister Rishi Sunak said in a statement that "as Ukraine makes strategic progress in their counteroffensive... we are stepping up our formal arrangements to protect Ukraine for the long term.

"What has happened in Ukraine cannot be repeated, and this declaration reaffirms our commitment to making sure it is never again exposed to the kind of brutality Russia has inflicted upon it."

The declaration will serve as a framework for later bilateral agreements between individual countries and Kiev that will specify the weapons they will donate.

US Vice President Joe Biden has suggested a model for Ukraine that is similar to the one under which Washington has committed to providing Israel with $3.8 billion in military assistance annually over a ten-year period.

According to the head of the city's military administration, Russia launched drone attacks on Kyiv for the second consecutive night early on Wednesday.

According to Sergiy Popko on Telegram, all of the Iranian-made Shahed explosive drones that were launched at Kyiv were "detected and destroyed," and "there was no information about victims or destruction as of now."

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As a response to Russia's invasion, Ukraine has already received weapons worth tens of billions from its Western backers.

On Tuesday, Germany announced that it would spend an additional 700 million euros on additional tanks, Patriot missile defences, and armoured vehicles.

A coalition of 11 nations announced they will begin training Ukrainian pilots on F-16 jets starting next month, and France announced it was sending long-range missiles.

The pledges, however, fall short of Zelensky's ambitions to bring Kyiv under NATO's collective defence umbrella, despite being desperately needed by Ukraine's troops.

After the first day of their summit, NATO leaders vowed that "Ukraine's future is in NATO" and sped up the procedure Kyiv would eventually have to go through to join the alliance.

When allies concur and requirements are satisfied, we will be able to extend an invitation to Ukraine to join the alliance, according to a statement.

It reflects the worries of the dominant power, the United States, about getting dragged into a potentially nuclear conflict with Russia, but it didn't go much further than a 2008 pledge on future membership.

Zelensky had earlier fired a broadside, calling it "absurd" to not give Ukraine a deadline for joining. "Uncertainty is weakness," he roared.

NATO arranged the first meeting of a Ukraine-NATO council with him in Vilnius as part of their effort to persuade Zelensky that Kyiv is moving closer to the alliance.

Even though he now has a more significant seat at the table to set the agenda for negotiations with the alliance, he is still outside the club.

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In order to garner more support, Zelensky will meet with important allies on the sidelines of the sit-down, including Biden.

In a keynote address later on, Biden will outline Washington's commitment to defending every square inch of NATO territory at Vilnius University.