By Wiktor Szary and Pawel Sobczak

WARSAW Thu Jan 8, 2015 4:06pm GMT

Poland's Defence Minister Tomasz Siemoniak speaks during an interview with Reuters in his office at the Ministry of Defence in Warsaw April 10, 2014.

Credit: Reuters/Kacper Pempel

WARSAW (Reuters) - Poland expects the NATO alliance to step up its military exercises around the Baltic Sea after a flurry of activity by Russian warships and jet fighters in the area last month, Defence Minister Tomasz Siemoniak told Reuters in an interview.

"What happened in December was indeed rather unprecedented," Siemoniak said. "We will definitely want the Baltic Sea to be taken into account to a greater extent, and I think that in terms of military exercises planned by NATO, there will be such a reaction," he said. The interview was conducted on Monday but authorised for release by the ministry on Thursday.

The Atlantic alliance has already increased the frequency of air patrols in the region, part of a revival of Cold War tensions sparked by Russia's annexation of Crimea from Ukraine and its support for Ukraine's pro-Russian rebels.

Siemoniak said Moscow did not have an exit strategy, and that NATO and the European Union, which has imposed sanctions on Russia together with the United States, should brace themselves for years of conflict.

"We shouldn't talk about lifting the sanctions too soon," he said, adding that they were the most effective tool at the West's disposal.

The French government in November put on hold a contract to supply Mistral warships to Russia after coming under pressure from NATO allies.

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Poland to seek NATO response to Russia's Baltic exercises