The reason for moving the Iskander-M missiles, which have a range of 500 kilometers, or far enough to reach deep inside of Poland, could be an attempt to show strength to NATO, said the official, who spoke on the condition of anonymity.

“They moved a similar missile system into Kalinigrad in 2014 for a military exercise. It could also be a political gesture — a show of strength — to express displeasure with NATO,” Reuters cited the official as saying.

Referring to reports about the missile system, Estonian Prime Minister Taavi Rõivas called the move to Kalinigrad “alarming” and an attempt to “pressure the West by using different tools.”