NATO Secretary General Mark Rutte speaks during a press conference at the alliance's headquarters in Brussels, Wednesday. Reuters-Yonhap

NATO chief Mark Rutte said Wednesday that Russia was giving support to North Korea's missile and nuclear programs in exchange for Pyongyang sending troops to fight in the war with Ukraine.

He urged NATO members to send enough arms to Ukraine to change the course of the conflict as Russian forces make gains along the frontline.

"In return for troops and weapons, Russia is providing North Korea with support for its missile and nuclear programs," Rutte told journalists after a meeting of NATO foreign ministers.

"These developments could destabilize the Korean Peninsula and even threaten the United States."

Ukraine and its allies say North Korea has sent soldiers to Russia to fight alongside Moscow's forces in the Kursk region.

Rutte has stressed the risk the alliance between Moscow and Pyongyang poses to the United States ahead of Donald Trump's return to office.

Washington's allies are trying to find ways to convince Trump that it is in his interest to keep up US support for Ukraine.

The volatile Republican has cast doubt on continuing vast U.S. military aid to Kyiv and promised to cut a quick deal to end the war.

"The increasing alignment of Russia, China, North Korea and Iran highlights the global nature of the threats we face, including the escalating dangers of the ongoing war in Ukraine," Rutte said.

The situation on the battlefield is looking increasingly grim for Ukraine as Trump's inauguration comes near.

Russian forces are advancing along the front line as Kyiv's fatigued forces struggle with weapons supplies and manpower shortages.

"We must provide enough support to change the trajectory of this conflict once and for all," Rutte said.

"We discussed what more allies can do to provide critical ammunition and air defences." (AFP)