Russian troops during an Arctic airmobile assault at Kotelny Island, within the New Siberian Islands. Ministry of Defence of the Russian Federation The Nordic countries, not generally known for extreme foreign policies or a habit of overreacting to current events, have started to voice increasingly louder concerns over Russia's role in the Baltics and the Arctic.

In early April, the five Nordic nations — Iceland, Denmark, Norway, Sweden, and Finland — announced their plans to expand defense ties.

The move toward further collective defense treaties showcases just how concerned these states have become: Iceland, Denmark, and Norway are already full NATO members. Sweden and Finland had steered away from the organization out of concerns over infuriating Russia — but they are thinking about the alliance again.

In any case, as Moscow plays a larger belligerent role in the Arctic and the Baltics, Finland and Sweden have reevaluated the risks and have found banding together with the other Nordic countries to be worth the increased risk of an angry Russia.

"Russia's actions are the biggest challenge to the European security," the defense ministers from the Nordic nations said in a joint declaration. "Russia's propaganda and political maneuvering are contributing to sowing discord between nations, and inside organizations like NATO and the EU. The Nordic states. Jeremy Bender/Google

"There is increasing military and intelligence activity in the Baltics and in our northern areas," it said. "The Russian military is challenging us along our borders and there have been several border infringements in the Baltics."

The Kremlin has played an increasingly provocative role over the Baltic Sea since the annexation of Crimea in March 2014.

Since then, Moscow has sent unprecedented numbers of jets and boats throughout the region, forcing the scrambling of NATO air-policing forces. In a move that caught the public's eye, Sweden contended (and remains convinced) that Russia sailed submarines through its territorial waters between October 17 and 24.

The threats in the Baltic were further compounded by Russia's unrelenting militarization of the Arctic region. The Kremlin is activating a key Arctic military base only 30 miles from the Finnish border.

Beyond that base, Moscow has undertaken a construction blitz across the Arctic in a bid to ensure that it remains the unchallenged military power in the region. Moscow is constructing 10 Arctic search-and-rescue stations, 16 deepwater ports, 13 airfields, and 10 air-defense radar stations across its Arctic coast.

On Sunday, Norway demanded an explanation from Russia as to what Deputy Prime Minister Dmitry Rogozin was doing in the Norwegian archipelago of Svalbard. Since the Russian annexation of Crimea, Norway has placed Rogozin on a sanction list that bars him from traveling to Norwegian territory.

During Rogozin's trip, which took him to a Russian station by the North Pole, the deputy referred to the Arctic as a "Russian Mecca" because of its overwhelming geopolitical significance for Moscow.

Russia's focus on the Arctic stems from the unclaimed natural resources under the ice. The US estimates that a possible 15% of the earth's remaining oil, 30% of its natural gas, and 20% of its liquefied natural gas are stored within the Arctic sea bed.