File Photo: Jens Stoltenberg (AFP Photo)

The former Norwegian prime minister -- the first NATO secretary general from a country bordering Russia -- is known for his good relations with President Vladimir Putin and Prime Minister Dmitry Medvedev.

During his decade in power, the two countries signed milestone agreements on the delineation of their frontier in the Barents Sea and on visa exemptions for their border populations.

An economist by training, the former Labour Party head has never shown any particular fondness for defence or security matters.

But his experience has left him with a strong international network and honed his skills as a cross-border negotiator, both of which could prove essential.

The 55-year-old will take office on Wednesday, at a moment in history when NATO's face-off with Russia over Ukraine has sparked tensions not seen since the collapse of the Soviet bloc.

"It's very hard to anticipate how he will behave in this position regarding his rather positive past with Moscow," said Vivien Pertusot at the French Institute of International Relations in Brussels.

"He's been extremely silent these last months, since his appointment became public. Will he follow the firm steps of (his Danish predecessor Anders Fogh) Rasmussen or will he try to become a soothing mediator?"

Despite unrest in several countries of interest to NATO, including Ukraine, Syria, Libya and Afghanistan, Stoltenberg has remained tight-lipped.

The only hint he has given as to his stance was when he told Norwegian news agency NTB on September 23 that "continuing as before (with Russia) is not an option".

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New NATO Chief Jens Stoltenberg Brings Russia Ties to Job