The NATO alliance could emerge stronger after a period of internal divisions and must keep Turkey at the heart of trans-Atlantic ties, U.S. Secretary of State Antony Blinken said on Tuesday.

Blinken said that, despite public differences with Ankara, the United States and NATO had a strong interest in keeping Turkey anchored in the alliance.

"Turkey is a long-standing and valued ally," Blinken told an event at NATO headquarters, saying it was also in Ankara's interest to remain in the alliance.

America's top diplomat adopted a positive tone at the start of a two-day meeting of alliance foreign ministers as he looks to rebuild ties strained by former U.S. President Donald Trump.

Diplomatic sources told Daily Sabah that Foreign Minister Mevlüt Çavuşoğlu and Blinken are expected to meet on the sidelines of the NATO meeting and discuss bilateral ties.

The two top diplomats had their first phone call under the new Joe Biden administration last month. Congratulating Blinken for his new position as the secretary of the state, Çavuşoğlu said that Turkey is willing to have a dialogue based on mutual respect with the new U.S. administration.

Ties between NATO allies Turkey and the U.S. were badly strained last year over Ankara’s acquisition of the advanced S-400 Russian air defense system, prompting Washington to remove Turkey from its F-35 Lightning II jet program.

The U.S. argued that the system could be used by Russia to covertly obtain classified details on the Lockheed Martin F-35 jets and is incompatible with NATO systems. Turkey, however, insists that the S-400 would not be integrated into NATO systems and would not pose a threat to the alliance.

Ankara has repeatedly stressed it was the U.S.' refusal to sell it Patriots that led it to seek other sellers, adding that Russia had offered a better deal, including technology transfers. Turkey even proposed setting up a commission to clarify any technical issues.

Issues, including Syria, the S-400 missiles and the extradition of Fetullah Gülen – the mastermind of the July 15 coup attempt orchestrated by the Gülenist Terror Group (FETÖ) – as well as U.S. support for a terrorist organization threatening Turkey’s security have led to mounting tensions between the two partners.

However, intra-Afghan peace talks emerge as an area of cooperation between the two countries. Earlier this month, Blinken proposed a United Nations-led peace conference in Turkey with the aim of finalizing a peace agreement in a letter to Afghanistan's President Ashraf Ghani. Following the news, Turkey expressed its readiness to take part in mediation efforts to establish peace in Afghanistan and the region.

Speaking on the issue at the NATO summit, Blinken pledged to share Washington's "initial thinking" on a looming Afghanistan withdrawal deadline.

High on the agenda for NATO is the future of the alliance's 9,600-strong mission in Afghanistan after Trump struck a deal with the Taliban to withdraw troops by May 1.

"We have a review underway in the United States. I'm here today in part to share some of our initial thinking with our NATO allies," Blinken said in opening remarks with alliance chief Jens Stoltenberg.

Biden said last week that it would be "tough" for Washington to meet the looming deadline.

That prompted outrage from the Taliban, who warned that the U.S. would be "responsible for the consequences."

Ankara recently stated that Turkey will continue to support Afghan security. Turkey has been contributing to the security of Afghanistan and will keep its presence in the country as long as its Afghan brothers demand it, Çavuşoğlu said earlier this month, marking the 100th anniversary of diplomatic relations between the two countries.

The Turkish Parliament in late 2020 approved a motion to extend the deployment of Turkish troops in Afghanistan for 18 months as part of NATO's support mission in the war-torn country. The initial legislation took effect on Jan. 6, 2019, that allowed the Turkish government to send troops to Afghanistan to support the NATO-led mission Resolute Support. After ending the 17-year combat mission in Afghanistan in 2018, the mission has evolved into training and advising the nascent Afghan security forces.

Around 12,000 foreign troops from 28 NATO allies and 14 other partner nations agreed to support the NATO mission in Afghanistan. The legislation that was first passed in 2015 also grants the government authority to permit foreign army personnel to be transported to and from Afghanistan through Turkey.

Stoltenberg also touched upon relations with Turkey, acknowledging the difference in opinion regarding the S-400s issue and the Eastern Mediterranean conflict, but noted that NATO provides a significant platform to discuss and solve problems.