President of Belarus Alexander Lukashenko has turned down Poland's invitation to participate in memorial events on the occasion of the 80th anniversary of the outbreak of World War 2 because Russian President Vladimir Putin has not been invited to attend, sources say.

Due to the fact that Polish leadership ignored Vladimir Putin, "Belarusian authorities did not dare to delegate a senior politician to the event," Rzeczpospolita wrote, citing its source.

Read alsoPoland says Putin's presence on WWII anniversary inappropriate

Belarus will be represented by the country's ambassador, officials say.

As UNIAN reported earlier, on August 28, U.S. national-security adviser John Bolton said preparations were set to start for the Warsaw meeting of U.S. President Donald Trump and Ukrainian President Volodymyr Zelensky.