Poland's Armed Forces Operational Command has told PAP that it cannot confirm that a Polish soldier has defected to Belarus.
German Chancellor Olaf Scholz has assured Poland of solidarity amid the ongoing hybrid attack on its border by Belarus.
The situation on Poland's eastern border with Belarus has improved, the prime minister said on Monday.
Poland is holding talks with the Czech Republic and Hungary concerning military aid to help the country deal with the protracted migrant crisis on the border with Belarus, the defence minister said on Friday.
The Polish defence minister has announced that Estonian and British engineering troops, already in Poland, will soon start their mission on the country's border with Belarus.
The Belarusian defence attache has been summoned to Poland’s Ministry of Defence after searchlights installed on the border were apparently shot out by Belarusian forces using air guns.
The government will soon open a press centre in the border area with Belarus covered by a state of emergency, a deputy defence minister has said.
Poland's Border Guard has said there are currently about 10,000 migrants in Belarus planning to enter Poland illegally.
Current developments in the migrant crisis on the Polish-Belarusian border do not warrant the triggering of Nato's Article 4, the Polish foreign minister said on Friday.
Nato Secretary General Jens Stoltenberg has said in an interview with Italian daily Corriere della Sera that the alliance is in solidarity with Poland over Belarus's "cynical and inhuman" use of migrants as a tool of hybrid tactics.