July 7 (UPI) — Leaders of the Western world’s premier military alliance will gather in Ankara on Tuesday for the start of this year’s NATO summit, with support for Ukraine and questions over U.S. President Donald Trump’s commitment to the pact expected to dominate the two-day meeting.

The summit in Turkey’s capital is formally focused on reviewing progress made since last year, when the leaders of NATO’s 32 members agreed to raise their annual defense-related spending from the previous 2% target to 5% of gross domestic product by 2035 amid growing global security concerns.

Major new policy pronouncements are not expected, though several large arms deals are. The focus of the two-day summit will be on progress toward that defense-investment plan and how allies intend to spend the money to increase weapons production, cooperation and joint procurement.

Attention will also be on Trump and the U.S. commitment to NATO after his administration announced earlier this year that it would withdraw some American troops from Germany.

Long a demand of Trump’s, the increase in defense spending has done little to curb the American president’s long-held criticism of the alliance, which has intensified since NATO allies offered limited support for the U.S. war against Iran.

Trump departed Maryland’s Joint Base Andrews aboard Air Force One for Turkey a little after 9:40 EDT Monday, with State Secretary Marco Rubio, Treasury Secretary Scott Bessent, Defense Secretary Pete Hegseth and a number of aides with him.

Trump is expected to meet with Zelensky during the summit.

The two spoke Saturday, according to the Ukrainian leader, who said he called the U.S. president to congratulate him on the United States’ Independence Day.

“We are grateful to the United States for all the assistance we have received — from Javelins and Patriots to political support — and we deeply value that America stands by us in defending our independence,” he said online, adding that they had discussed the situation in the Ukraine-Russia war.

“We have agreed to continue these discussions during the NATO Summit in Ankara,” he said.

On the eve of the Fourth of July, Trump also spoke with Russian President Vladimir Putin for nearly 90 minutes, according to the Kremlin, which said in a statement that they discussed “the Ukrainian settlement, including in light of Donald Trump’s upcoming participation in the NATO Summit.”

The Kremlin said Putin framed the current situation of the war as Russia “steadily advancing” despite Ukraine making recent gains and expanding its long-range attacks.

However, Russia has been targeting Kyiv with massive attacks leading up to the summit. Zelensky has been calling on allies for additional long-range weaponry, or the ability to produce the arms themselves, arguing that if Ukraine can batter Moscow how the Kremlin has been hitting Kyiv, an end to the war could be rapidly secured.

“We have proven to all our partners both the need, and more importantly, the possibility of providing greater protection of lives,” Zelensky said in a Monday statement.

“It is simply nonsensical that, in today’s world, production has still not been scaled up to the level that is actually needed to protect people from ballistic terror. We have long made the case that we are capable of producing such defensive weapons ourselves. If Ukraine were granted U.S. licenses to produce Patriots, our own production would be sufficient both to protect Ukraine and to help partners in need.”

The U.S.-based Institute for the Study of War said Monday night that Russian forces were likely timing these large-scale strikes to send a political message ahead of the summit.