Hundreds of Swedish troops arrived in Latvia on Saturday to join a Canadian-led multinational brigade along NATO’s eastern flank, a mission Sweden is calling its most significant operation so far as a member of the Western defense alliance.

A ship carrying parts of a mechanized infantry battalion arrived early Saturday in the port of Riga, the Latvian capital, escorted by the Swedish air force and units from the Swedish and Latvian navies, the Swedish armed forces said in a statement.