As the NATO summit approaches this month, Finland and Sweden's demands to join the alliance remain in question. As VOA's Dorian Jones reports from Istanbul, Turkish President Recep Tayyip Erdogan is toughening his stance against the two countries' membership, accusing them of supporting terrorism.
With much fanfare, Sweden and Finland formally applied in May for NATO membership. At the time, the application was seen as a formality, but now the fate of their application is uncertain.
Turkish President Recep Tayyip Erdogan says he will veto the applications of Sweden and Finland if they do not end what he calls support for the Kurdish rebel group PKK, which fights against Turkish forces and which Ankara considers a terrorist group.
Helsinki and Stockholm deny supporting the PKK. Finnish and Swedish officials say they are trying to address Turkey's concerns.
"The fact is that Turkey holds a very important card, veto it. And I think it will not be resolved so easily," Asli Aydintasbas, a researcher with the European Council on Foreign Relations, told VOA.
The United States and the European Union have designated the PKK a terrorist organization.
President Erdogan is also calling on various countries to stop supporting the Syrian Kurdish group YPG, which he says has ties to the PKK.
Finland, Sweden and several NATO countries, including the United States, support the YPG, which has been a key ally in the fight against the Islamic State group in northern Syria.
President Biden could be the real target of hardening Mr. Erdogan's position on NATO enlargement.
"Many people think that the opposition to Finland and Sweden are really messages for the United States to take Turkey seriously, to engage with Turkey and for President Biden to revive the personal relationship that President Erdogan had with President Trump," he said. Professor of International Relations at Kadir Has University, Soli Ozel.
Unlike his predecessors, President Biden, who criticizes the human rights situation in Turkey, has generally avoided direct interaction with President Erdogan. Analysts say Washington will ignore Turkey's threat of a veto by deploying security forces alongside other NATO countries on the territory of Sweden and Finland, further isolating Turkey.
Experts say the stalemate is having repercussions on the Turkish economy, while the Turkish lira is already under increasing pressure.
However, analysts say this is an award that President Erdogan is prepared to pay, aware that the image of a person challenging NATO is well received by his constituents.