"Following the information we got from the government, we very likely will say 'no,'" Tommy Gardell, head of the island council's technical board, told The Associated Press. "We will align with the government."

Gotland officials were expected to decide Thursday whether to rent space in the ports of Slite and Karlshamn to Russia's energy giant Gazprom, which wants to store pipes there for the Nord Stream 2 undersea natural gas pipeline, which will run from Russia to Germany.

Read alsoSweden brings back Cold War weapons to deter Kremlin - The TimesDefense Minister Peter Hultqvist said renting out harbor space on Gotland - considered of strategic importance for military control of the Baltic Sea - would "negatively affect Sweden's defense and political interests." He did not elaborate, citing security reasons.

In September, Sweden stationed permanent troops on Gotland, which Hultqvist described as sending a signal after Russia's 2014 annexation of Crimea and its "increasing pressure" on the Baltic states of Estonia, Latvia and Lithuania.