LONDON -- Polish President Karol Nawrocki on Sunday signed a classified decree permitting a permanent NATO troop in Poland as part of "Eastern Sentry," the alliance’s new operation to defend against Russian drone attacks following last week’s incursion of craft into Poland.

Amid rising tensions between NATO and Russia, Moscow and Belarus are holding military exercises starting on Friday that include "planning the use of nuclear weapons" and testing ballistic missiles, the state-run Tass news agency reported.