flickr.com/photos/bubbahop

"On July 18, Russian tow vessel Neptune was spotted about four nautical miles from the border of Latvia," the statement says.

Read alsoNewsweek: 600 Czech, Slovak, Polish and Hungarian troops to reinforce BalticsThis is not the first time Russian ships have been spotted near the Baltic state's borders.

"On June 1, Latvian armed forces spotted two Russian Parchim-class corvettes seven nautical miles away from Latvia's border," reads the statement.