NATO will deploy a permanent full-scale military force on its border with Russia to defend its territory against a future Russian invasion, the alliance's chief said during an interview with The Telegraph.

NATO is in the midst of a fundamental transformation that will reflect on the actions of Russian President Vladimir Putin, according to NATO Secretary-General Jens Stoltenberg.

The new normal for European security is what we see now, and we have asked our military commanders to provide options for what we call a reset.

The alliance has a small presence to the west of Russia. NATO troop numbers have gone up tenfold since the invasion of Ukraine, according to The Daily Mail.

Theset will involve deploy sufficient forces to repel any offensive on NATO nations by Russian troops, according to The Telegraph. NATO members bordering Russia include Estonia and Latvia.

The newspaper said NATO military commanders are discussing and developing their options.

The NATO summit in Madrid in June will be where the issue of a strengthened military presence will be raised.

NATO had to tread carefully during the war in Ukraine, working out how best to support the war-torn nation while avoiding an escalation and getting drawn into the conflict.

On Friday, members of the alliance agreed to give more military support to Ukraine.

The Prime Minister of Slovakia confirmed on Friday that his country had sent its air defense system to Ukraine, becoming the first NATO country to respond to President Zelenskyy's calls to supply powerful missile weaponry.

The S-300 is a Soviet-era long-range surface-to-air missile system that can shoot down cruise missiles and aircraft and has a range of up to 90 miles.

The first NATO country to send tanks to Ukraine was the Czech Republic.