Russia, on Thursday, urged Poland to reopen its border with Belarus, Moscow’s close ally, calling the closure “destructive” and warning of consequences.

Donald Tusk the Polish Prime Minister announced on Tuesday the closure of the border with Belarus from 0000 on September 12 (2200 GMT on September 11), in response to the upcoming joint Russian-Belarusian war games.

“We urge Warsaw to consider the consequences of such destructive steps and to review its decision as soon as possible,” foreign ministry spokeswoman Maria Zakharova said in a statement.

She added that the border closure was to “justify a policy of further escalating tensions in the centre of Europe”,

NATO’s eastern flank members Poland, Lithuania and Latvia are on high alert due to the massive drills, which according to Tusk are designed to simulate occupation of the Suwalki corridor, a strategically important area in Poland.