According to unnamed sources, Russia has made a “major strategic miscalculation” since Finland and Sweden appear to be on the verge of joining NATO as early as this summer.

According to the article, NATO membership for both Nordic nations was “a topic of discourse and many sessions” during last week’s meetings between the alliance’s foreign ministers, which Sweden and Finland attended.

Washington is betting on the move, which would strain Russia’s military and expand the Western alliance from 30 to 32 members, as a direct result of President Vladimir Putin’s invasion of Ukraine.

Finland was reportedly preparing for a possibly historic decision “before summertime” on whether to request to join NATO as a deterrent to Russian aggression, according to previous reports.

Finland Decides To Join NATO As Russia Invades Ukraine

The 5.5 million-strong Nordic nation has always avoided military alliances, partly to avoid offending its eastern neighbor, with which it shares a 1,300-kilometer (830-mile) border.

However, following Russia’s invasion of Ukraine on February 24, popular support for NATO membership increased from 30% to 60%, according to a series of surveys. Since Russia’s strike, Finland’s government has held a series of rigorous talks to solicit feedback from other NATO members on a potential membership bid.

Finland, along with its neighbor Sweden, has received public assurances from Secretary-General Jens Stoltenberg that the alliance’s door is still open. They also have statements of support from several members, including the United States, the United Kingdom, Germany, France, and Turkey. Sweden is conducting a security policy assessment that will be completed by the end of May, following Finland’s pattern, and its leader, Magdalena Andersson, stated two weeks ago that she would not rule out NATO membership “in any way.”

Attempting to join NATO would almost certainly be viewed as a provocation by the Kremlin. They have long considered the extension of the US-led alliance on its borders to be a serious security concern.