(LONDON) — Latvian Defense Miniter Andris Spruds announced Thursday that the country will become the latest NATO ally to close its airspace along its eastern borders with Russia and Belarus, following the intrusion of at least 19 Russian drones into Polish airspace this week.

“There is no immediate threat,” the minister said, adding that the border airspace will remain closed for at least one week until Sept. 18.

The country’s armed forces are “on heightened alert” during the “Namejs” military exercise, which began on Sept. 2 and will run until Oct. 8, Spruds said.

“Russian unmanned aerial vehicles in NATO airspace are a warning signal, and we must do everything possible to prevent an escalation of drone attacks,” the minister said in a statement published by the Defense Ministry.

“The

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