Jens Stoltenberg spoke as 4,000 troops prepare to shore up defenses around the Baltic Sea.
Iskander units were drafted in the exercise close to the Estonian border.
Putin says NATO's plans are destabilizing. NATO should explain why they aren't.
Russia strongly protested the move to take down the Communist monument.
Alexander Nosatov was deputy commander of the Black Sea Fleet during the Crimea annexation.
Estonia's Ministry of Defence claims Russian jets violated its airspace four times in 2016.
Baltic armed forces are set to practice urban warfare in an artificial town.
To send a message to Putin, NATO plans to deploy military units to Eastern Europe in numbers unmatched since the Cold War.
Less than 6 percent of the U.K.'s Poles plan on leaving.
Historically, NATO and the EU don't normally work together, but this is changing.
The Ministry of Defense wants a new center to coordinate Baltic deployments.
Poland's defense minister has confirmed discussions with NATO's Secretary General.
It was the first time British fighter jets have responded since the Typhoons were deployed in late April.
Maardu marked May 9 with a ceremony honouring Soviet troops.
Alexei Pushkov had some harsh words for the new NATO U.S. European commander, Curtis Scaparrotti.
Saber Strike 16 will be one of the final tests before a NATO summit in July.
The pipeline will provide almost all the gas requirements of the region's EU states