THE HAGUE, June 25 (Reuters) - NATO leaders gathered in The Hague on Wednesday for a summit tailor-made for U.S. President Donald Trump, with European allies hoping a pledge to hike defence spending will prompt him to dispel doubts about his commitment to the alliance.
The summit is expected to endorse a higher defence spending goal of 5% of GDP - a response to a demand by Trump and to Europeans' fears that Russia poses an increasingly direct threat to their security following the 2022 invasion of Ukraine.

NATO Secretary General Mark Rutte acknowledged that it was not easy for countries to find the money for extra defence spending but said it was vital to do so.
"There is absolute conviction with my colleagues at the table that given this threat from the Russians, given the international security situation, there is no alternative," he told reporters on Wednesday morning.
NATO officials are hoping the conflict between Israel and Iran, and the U.S. bombing of Iranian nuclear sites at the weekend, will not overshadow the gathering, hosted by Rutte in his home city.
Trump has threatened not to protect NATO members if they fail to meet spending targets and he raised doubts about his commitment again on his way to the summit by avoiding directly endorsing the alliance's Article 5 mutual defence clause.

Speaking to reporters aboard Air Force One, he said there were "numerous definitions" of the clause. "I'm committed to saving lives. I'm committed to life and safety. And I'm going to give you an exact definition when I get there," he said.
The new target - to be achieved over the next 10 years - is a big increase on the current goal of 2% of GDP, although it will be measured differently. It would amount to hundreds of billions of dollars in extra annual spending.
Countries would spend 3.5% of GDP on core defence - such as troops and weapons - and 1.5% on broader defence-related measures such as cyber security, protecting pipelines and adapting roads and bridges to handle military vehicles.
All NATO members have backed a statement enshrining the target, although Spain declared it does not need to meet the goal. Madrid says it can meet its military commitments to NATO by spending much less - a view disputed by Rutte.

But Rutte accepted a diplomatic fudge with Spanish Prime Minister Pedro Sanchez as part of his intense efforts to give Trump a diplomatic victory and make the summit go smoothly.