Military units of the Polish gendarmerie will assist the country's army in patrolling the border with Belarus, the PAP news agency reported.
Joint patrols will begin in the next few days after the head of the gendarmerie proposed the decision to Poland's defense minister Władysław Kosyniak Kamis following the death of a soldier who was stabbed while guarding the border.
The Minister of Foreign Affairs of Poland, Radoslaw Sikorski, made a strong request to the Belarusian authorities to identify and extradite the person responsible for the murder.
He also noted that the investigation is ongoing and called on Belarus to provide full cooperation. "We urge the Belarusian authorities to identify the killer and hand him over to the Polish authorities within the framework of the investigation already being conducted by our Ministry of Justice," he said.
In response to the incident, the Belarusian chargé d'affaires at the Ministry of Foreign Affairs was handed an official protest note later on Thursday.
Late last month, a soldier from the 1st Polish Armored Brigade was stabbed by migrants trying to cross the Polish-Belarusian border fence. The military said the serviceman, identified only as Mateusz, died in hospital on Thursday.
Belarus has said it is ready for a unilateral or bilateral investigation into the death of the Polish soldier, but on the condition that Warsaw provides "specific information about the circumstances".