The Canadian government has selected Germany’s TKMS to build a fleet of submarines for this country, two sources say.

The Globe and Mail is not identifying the sources because they were not authorized to speak publicly about the matter.

Prime Minister Mark Carney will announce the government’s decision in Halifax Monday — the outcome of a high-stakes competition between Germany and South Korea for a lucrative contract to build 12 submarines for Canada.

The purchase will give this country an unprecedented ability to patrol its coastal waters undetected. Mr. Carney had previously said the government would make its decision by the end of June, but didn’t specify an exact date.

The announcement, which the Prime Minister will unveil before jetting to the NATO leaders’ summit in Turkey, will bring an end to a closely fought campaign by Germany’s TKMS and South Korea’s Hanwha, rivals in a contest that will shape the Royal Canadian Navy for decades.