Belarusian president Aleksandr Lukashenko will not visit the Russian part of exercise Zapad 2017. Kommersant.ru reports that Lukashenko was scheduled to appear at training sites in Russia alongside Vladimir Putin but for unknown reasons the plans have changed. Putin may still show up to spectate the exercise in Russia but Lukashenko will only observe the exercise on Belarusian training grounds.
During Zapad 2013 the two presidents appeared together in both countries but this year something is different. I guess the Russians are really serious about not allowing foreign observers to the exercise on their territory.