Turkey's top officials have sharply criticised a decision by the United States to arm Kurdish fighters battling ISIL in Syria - with Washington responding that it will address Ankara's security concerns, according to Al Jazeera. Dana White, the Pentagon's chief spokeswoman, said in a written statement on Tuesday that President Donald Trump decided to "equip Kurdish elements of the Syrian Democratic Forces (SDF) as necessary to ensure a clear victory" against ISIL in Raqqa, the group's self-declared capital in Syria. Turkey views the Kurdish Peoples' Protection Units (YPG), a central part of SDF, as the Syrian extension of the outlawed Kurdistan Workers Party (PKK), which has fought the state in the southeast of Turkey since 1984 and is considered a "terrorist group" by the US and EU. Turkish President Recep Tayyip Erdogan said on Wednesday that he hoped the decision will be changed by the time he visits Washington for talks with Trump next week. "I hope very much that this mistake will be reversed immediately," Erdogan said. "I will personally express our worries in a detailed way when we talk with President Trump on May 16," he added, saying the issue would also be discussed at the NATO summit in Brussels on May 25. Prime Minister Binali Yildirim said earlier on the same day that he could not imagine the US having to choose between Turkey's strategic partnership and a "terrorist organisation". "The US administration still has chances to consider Turkey's sensitivities on the PKK. If there is a decision otherwise, this will surely have consequences and will yield a negative result for the US as well," Yildirim said, speaking at a news conference in Ankara before departing for London. Every weapon obtained by the Syrian Kurdish YPG fighters constitutes a threat to Turkey, Turkish Foreign Minister Mevlut Cavusoglu said, reiterating Ankara's opposition to the US deal to arm the Kurdish fighters. In response to the Turkish remarks, US Defence Secretary Jim Mattis said he was confident Washington would be able to resolve tensions with Turkey over the the issue. "We’ll work out any of the concerns ... We will work very closely with Turkey in support of their security on their southern border. It's Europe's southern border, and we'll stay closely connected," Mattis told reporters during a visit to Lithuania. His comments came a day after Sean Spicer, the White House press secretary, said that the US wants to reassure the people and government of Turkey that it is committed to preventing additional security risks and protecting our NATO ally.