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President Joe Biden met with Turkish President Recep Tayyip Erdoğan at the NATO summit in Madrid Wednesday, where he thanked Erdoğan for dropping his objections to Finland and Sweden becoming NATO members.

“I want to particularly thank you for what you did putting together the situation with regard to Finland and Sweden and all the incredible work you're doing to try to get the grain out of Ukraine and Russia,” Biden said.

“We think your pioneering in this regard is going to be crucial in terms of strengthening NATO for the future,” Erdoğan said. “And it's going to have a very positive contribution to the process between Ukraine and Russia.”

Senior administration officials told reporters Wednesday that the U.S. made no formal offer in exchange for Erdoğan dropping Turkey’s resistance to Finland and Sweden becoming NATO members.

The U.S. Department of Defense earlier came out in support of Turkey’s plans to modernize its aircraft fleet with American-made F-16s.

-ABC News' Gabe Ferris

The leaders of NATO countries have invited Sweden and Finland to join NATO, they announced at the Madrid summit.

NATO leaders in their declaration called Russia "the most significant and direct threat to Allies' security and to peace and stability in the Euro-Atlantic area."

President Joe Biden offered a smile and fist pump when NATO Secretary General Jens Stoltenberg spoke about the newest invitees to the alliance.

Tennis players competing at Wimbledon have shown support for Ukraine in a rare break with the tournament's usual all-white dress code.

Several players, including the women's world top player, Iga Swiatek, sported blue-and-yellow ribbons on Tuesday in a sign of solidarity with Ukraine.

-ABC News' Edward Szekeres, Max Uzol, Yuriy Zaliznyak

Spanish Prime Minister Pedro Sánchez, who is hosting a NATO summit in Madrid, said Russia will be identified as the alliance's "main threat" in its new strategic concept unveiled during the summit.

“The strategic concept of Madrid will be naming Russia as the main threat of the allies,” Sánchez told Spanish media on Wednesday. NATO previously considered Russia a strategic partner.
Sánchez stressed that Russian President Vladimir Putin was the only person “responsible for this substantive change.”

During a speech at the NATO summit on Wednesday, the Spanish Prime Minister said the summit carried a clear signal for Putin.

“We are sending a strong message to Putin: 'You will not win,'” Sánchez said.

Ukrainian Defense Minister Oleksii Reznikov said on Facebook on Tuesday that thousands of Ukrainian soldiers had mastered the use of weapons supplied by Western countries, while other troops are in ongoing training.

Reznikov said Ukrainian specialists were training on aviation and other types of high-tech weaponry, including artillery systems and means of reconnaissance.

“We are learning at a fast pace,” the defense minister added. “Any weapon in the hands of the [Ukrainian] Armed Forces becomes even more effective."

In his speech at the NATO summit on Wednesday, Ukrainian President Volodymyr Zelenskyy repeated his plea for more weapons supplies, highlighting Ukraine's need for more modern artillery systems.

To break Russia's artillery advantage, Ukraine needs “much more modern systems, modern artillery," Zelenskyy said.

-ABC News' Edward Szekeres, Max Uzol, Yuriy Zaliznyak