NATO is working on plans for a permanent military presence on its border in a bid to combat future Russian aggression, Britain's Daily Telegraph reported, quoting Pact Secretary General Jens Stoltenberg.

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NATO is in the midst of a very fundamental transformation that will reflect the long-term consequences of the actions of Russian President Vladimir Putin, Stoltenberg said in an interview with Reuters.

"What we are witnessing today is a new reality, a new norm for European security.

That's why we asked our military commanders to give us options for what we call a readjustment, a long-term adjustment of NATO, "Stoltenberg said.

In an interview, the secretary general also said that decisions on readjustment would be made at a NATO summit in Madrid in June.

Stoltenberg: The war in Ukraine could last for years

Russia's invasion of Ukraine has caused Europe's biggest refugee crisis since World War II and prompted Western countries to rethink their defense policies, according to Reuters.

The Russian invasion of Ukraine