Speaking alongside Turkish President Recep Tayyip Erdogan, Trump argued that the Arctic island was strategically important to US national security , citing the presence of Russian and Chinese ships in nearby waters.

"It was Greenland that, and it continues to be, that should be controlled by the United States, not by Denmark. And when they wouldn't go along with it, and with all the money we spent to help them with Russia, and we don't have to spend any money, we could remove all of our soldiers out of Europe," Trump said.

He also warned European allies to focus on immigration and energy policies.

"If they're not careful with those two things, you're not going to have a Europe anymore," he added.

Greenland is a self-governing territory within the Kingdom of Denmark. Both the Danish and Greenlandic governments have repeatedly rejected the idea of a US takeover, maintaining that the island's future should be determined by the people of Greenland.

Trump's remarks came as NATO leaders gathered in Ankara on July 7 and 8 to discuss defence spending, continued support for Ukraine and the future direction of the alliance.

Speaking on the alliance's security priorities, Rutte argued that NATO members must rapidly increase defence production to respond to evolving global threats.

" Russia is pouring almost half of its national budget into its war machine," he said.

He also accused China of expanding its military capabilities without sufficient openness.

" China continues to modernise its armed forces and expand its nuclear capabilities without transparency," he said.

Rutte claimed the DPRK was continuing to strengthen its nuclear programme while supporting Russia.

"The DPRK continues to expand its nuclear programme and supply Russia," he added.

Turning to Iran , the NATO chief said recent US military action had weakened Tehran's capabilities but cautioned that the alliance should remain alert.

"While recent US action has significantly degraded Iran's nuclear and ballistic missile programmes, we must remain vigilant. These countries are increasingly working together," he warned. "I assure you, they do not have our best interests in mind."

Rutte said NATO must respond by dramatically expanding its defence industry.

"To meet the challenge, we need a transatlantic defence industrial revolution. The hum of machinery must become a roar. Now, that sounds dramatic, but it can be done," he added.

His remarks came as the Russia- Ukraine conflict entered its fourth year, with Ukraine continuing to receive military support from NATO member states. Russia has repeatedly criticised Western arms deliveries, arguing they prolong the conflict. Russian Foreign Minister Sergei Lavrov said the continued supply of weapons "will not prevent us from achieving our goals."

Rutte's comments also followed the joint US-Israeli military operation against Iran on February 28, which Washington said was aimed at preventing Tehran from obtaining a nuclear weapon.