LIVE UPDATES: Ankara Confirms Support to NATO Open Door Policy, Backs Finland's, Sweden's Membership

"Later, the President will meet with President Recep Tayyip Erdoğan of Turkey to discuss the Alliance’s collective defense and security and a range of issues important to the bilateral relationship," the White House said on Tuesday.

China has argued for a peaceful resolution to the conflict in Ukraine and supports negotiations between Kiev and Moscow.

"Congratulations to Finland, Sweden, and Turkey on signing a trilateral memorandum - a crucial step towards a NATO invite to Finland and Sweden, which will strengthen our Alliance and bolster our collective security - and a great way to begin the Summit," Biden said in a tweet.

Finland and Sweden also agreed to amend their national legislation "in the field of counter-terrorism and the defense industry," Erdogan’s office said.

"Our joint memorandum underlines the commitment of Finland, Sweden and Turkey to provide full support in combating threats to each other's security. Us becoming NATO allies will further strengthen this commitment," the office said.

According to the media, Johnson has been preparing for a rise in defense spending and is expected to announce this decision at a NATO summit in Spain.

US President Joe Biden said on Tuesday that Washington and Madrid will be working together to increase the number of US naval destroyers stationed in the country.

"Mr. President [Pedro Sanchez], you and I discussed today, we're going to work on an agreement to increase the number of US naval destroyers stationed at Spain's Rota naval base, which will also enhance the bilateral defensive relationship between Spain and the United States. We expect that to occur much sooner than later," Biden said during a press conference.

The two leaders met on the sidelines of the NATO summit taking place in Madrid this week.

Earlier in the day, Bloomberg reported that the alliance is set to label China as a "systemic challenge" when outlining its new policy guidelines this week.

Madrid is hosting the leaders' summit on June 28–30.

The United States will announce on Wednesday a new long-term deployment of troops in Europe, US National Security Advisor Jake Sullivan said.

"In the summit you will see that the alliance will follow through on this commitment [to enforce NATO's posture in response to the Ukraine crisis]," he said. "The United States will be making specific announcements tomorrow on land, see and air of additional force posture commitments over the long term, beyond the duration of this crisis, however long it goes on."

The White House later confirmed that the presidents had agreed to meet on the sidelines of the NATO summit to discuss the conflict in Ukraine, as well as terrorism and the alliance's collective security.

"President Biden noted he looks forward to seeing President Erdogan at the NATO Summit in Madrid where leaders will discuss the consequences of Russia’s invasion of Ukraine for Transatlantic security and other threats to the Alliance," it said.

Erdogan said that deliveries of F-16 fighters to Turkey were "still on the table." Turkey made a request to buy US-made jets after Washington kicked Ankara out of the advanced F-35 joint production program to punish it for buying Russian S-400 air defense missile systems.

NATO is set to label China as a “systemic challenge” when outlining this week its new policy guidelines, Bloomberg reported citing sources familiar with the matter.

The North Atlantic alliance will also highlight China's deepening partnership with Russia, the report said.

It said the so-called Strategic Concept will outline NATO's priorities for the coming decade, and is to be signed by NATO leaders at the Madrid summit this week. The previous 2010 version did not mention China and called Russia a partner, which is set to be changed.