The North Atlantic Treaty Organisation (NATO) is losing its military advantage over Russia and the redefining of its new strategy in May was meant to address this issue of concern for the alliance, Chairman of the US Joint Chiefs of Staff Gen. Joseph Dunford said.

Axar.az reports citing foreign media that Dunford met with the NATO Military Committee last weekend in Slovenia's capital city of Ljubljana to discuss alliance efforts in Afghanistan, Iraq, and Kosovo, as well as to assess its efforts in global deterrence.

Following the meeting, Dunford said, as quoted in a statement released by the US Department of Defence on Tuesday that Russia was becoming a major military competitor due to its improving defense capabilities and that NATO's advantage over Russia had eroded.

The alliance's defense chiefs recognized this tendency and saw a need to redefine its own deterrence strategy, Dunford added, referring to their meeting in Brussels in May.

In the last several decades, Russia has been actively modernizing its military capabilities across all domains — including electronic warfare, and submarine and air defense — and maintains the world's largest operational nuclear stockpile, according to former US Director of National Intelligence Dan Coats.