Turkish President Recep Tayyip Erdogan attends a meeting. File photo
But Turkey said the four-way meeting, which will also involve NATO chief Jens Stoltenberg, did not mean that Ankara was close to lifting its objection to the two Nordic countries joining the military bloc.
Ukrainian President to press G7 for more help as war rages
G7 leaders set to commit to long haul in backing Ukraine
The Finnish presidency said the four leaders will meet in Madrid, before the start of the alliance's summit, which will focus on Russia's invasion of Ukraine.
The meeting "will be preceded (Monday) by a round of talks between Finnish, Swedish and Turkish officials hosted by NATO in Brussels", the Finnish presidency said.
Russia's invasion of Ukraine earlier this year saw the two Nordic countries abandon decades of military non-alignment by applying for NATO membership in May.
But the joint membership bid, initially believed to be a speedy process, has been delayed by objections from NATO member Turkey.
Ankara has accused Finland and Sweden, in particular, of providing a safe haven for outlawed Kurdish militants whose decades-long insurgency against the Turkish state has claimed tens of thousands of lives.
NATO chief Jens Stoltenberg speaks during a press conference. File photo
The Turkish leader has also called on Sweden and Finland to lift arms embargoes imposed against Turkey in 2019 over Ankara's military offensive in Syria.
Erdogan signalled on Saturday that no progress had been made in Sweden's bid to join NATO, urging Stockholm to take "concrete actions" to meet Ankara's concerns.
Turkish officials said Ankara does not view the summit as a final deadline for resolving its objections.
Erdogan's chief foreign policy adviser said Tuesday's four-way meeting did not mean that an agreement was imminent.
"Participating in this summit does not mean that we will step back from our position," Ibrahim Kalin told HaberTurk channel.
"We are conducting a negotiation. It has many stages."
Kalin said Finland and Sweden needed to make "serious changes" to their laws "and constitution" targeting outlawed Kurdish militants.
"We want you to show the same change against the PKK and its affiliated YPG, PYD and similar structures," he said in reference to Kurdish groups operating in Syria and Iraq.
Russian President Vladimir Putin sent troops in Ukraine in what he said was a "special military operation" to rid the country of fascists. Ukraine and the West said Putin launched an unprovoked "imperial" land grab.
Nato's 30 allies took the decision at their summit in Madrid and also agreed to formally treat Russia as the "most significant and direct threat to the allies' security," according to a summit statement.
With Finland and Sweden taking steps to join NATO amid Russia’s war in Ukraine, the list of “neutral” or nonaligned countries in Europe appears poised to shrink. Like the two Nordic countries, other nations joined the European Union for its promise
Less than three months after Russia invaded Ukraine, the announcements are a stunning reversal of the two Nordic countries' military non-alignment policies, dating back more than 75 years for Finland and two centuries for Sweden.
Sheikh Mohammed Bin Zayed expressed his thanks to Sheikh Tamim Bin Hamad for his congratulations and the sincere fraternal feelings he showed, wishing the brotherly State of Qatar and its people further progress and development.
Sheikh Sultan’s statement reads, “The Ruler of Sharjah congratulates Mansour Bin Zayed Al Nahyan on his appointment as Vice President."
Sheikh Mohammed said, “I congratulate my brothers Sheikh Hazaa, Sheikh Tahnoun, Sheikh Mansour and Sheikh Khaled Bin Mohamed for the confidence in the President of the State. In you and your brothers, the leaders of the new generation, the march continues.”