The head of NATO called Friday for the U.S., Russia and NATO to link their missile defence systems against potential new nuclear threats from Asia and the Middle East, saying that the old foes must forget their lingering Cold War animosity.

Secretary-General Anders Fogh Rasmussen appealed for unity a day after the U.S. shelved a Bush-era plan for an Eastern European missile defence shield that has been a major irritant in relations with Russia.

''We should explore the potential for linking the US, NATO and Russia missile defence systems at an appropriate time,'' Fogh Rasmussen said. ''Both NATO and Russia have a wealth of experience in missile defence. We should now work to combine this experience to our mutual benefit,'' he added.

Russian envoy Dmitry Rogozin said the NATO chief's address had a ''very positive tone ... cooperation with Russia is not a matter of choice (for NATO but) of necessity.''

Fogh Rasmussen said in a speech calling for a rethink of NATO-Russia relations that long-range ballistic missile technology in the hands of such countries as North Korea and Iran threatens the West and Russia in large part because it could lead to regional proliferation.

''If North Korea stays nuclear, and if Iran becomes nuclear, some of their neighbors might feel compelled to follow their example,'' he said. ''The proliferation of ballistic missile technology is of concern not just to NATO nations, but to Russia too.''

Fogh Rasmussen said NATO and Moscow have failed to jointly take on global security threats including terrorism.

''When the Cold War ended 20 years ago, NATO and Russia developed rather unrealistic expectations about each other,'' he said. ''Those flawed expectations ... continue to burden our relationship.''

The U.S. said the decision to abandon the Bush administration's plans came about because of a change in the U.S. perception of the threat posed by Iran. U.S. intelligence decided short and medium-range missiles from Iran now pose a greater near-term threat than the intercontinental ballistic missiles the Bush plan addressed.

A new missile-defence plan would rely on a network of sensors and interceptor missiles based at sea, on land and in the air as a bulwark against Iranian short and medium-range missiles.

Russian Prime Minister Vladimir Putin on Friday praised Obama's decision and urged the U.S. to also cancel Cold War-era restrictions on trade with Russia.

Russian leaders had threatened to deploy short-range missiles to Kaliningrad near Poland if the U.S. moved ahead with the missile defence plan.

On Friday, the Interfax news quoted an unnamed Russian military-diplomatic source as saying that such retaliatory measures would now be frozen and, possibly, fully canceled in response to Obama's decision to scrap the missile defence shield.

Russian President Dmitry Medvedev's foreign policy advisor Sergei Prikhodko told reporters Friday that Obama's move would require the Kremlin to ''attentively consider new possibilities opening up for cooperation and interaction.''

A key irritant in NATO's relations with Moscow is the drive to bring former Soviet states and satellites into the alliance which now has 28 members. The membership prospects of Georgia and Ukraine especially have soured relations.

While proposing an unprecedented level of military cooperation with Moscow, Rasmussen said NATO will continue to admit new members if they are judged suited for membership.

Rogozin said Russia continues to object to NATO's claim to be Europe's premier security provider, saying the alliance must formally recognize the Collective Security Treaty Organization that Moscow created in 2002. Its members include Russia, Armenia, Belarus, Kazakhstan, Kyrgyzstan and Tajikistan.

In the past, Russia has said it is ready to jointly work on missile defence with the NATO and the United States. But it views Iran being far from obtaining a long-range missile technology and says it's necessary to jointly analyze missile threats from that country and other nations before taking any further action.

In 2007, Putin who still was Russia's president at the time, offered the U.S. to use a Soviet-era radar in Azerbaijan as an alternative to the Bush administration's missile defence plan for Eastern Europe. The Bush administration said the facility couldn't replace the planned missile shield.

The NATO allies have done some technical work with the Russians on missile defence in the past. But this has slowed down in recent years as the relationship faded over NATO enlargement and the Georgian war. Fogh Rasmussen's speech is a bid to revive such joint work.

Turkey's military said Friday that it was planning to spend $1 billion (euro 680 million) on four long-range missile defence systems but denied it was buying missile interceptors for use against Iran.

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