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Over 2,000 troops from eight countries are engaged in the event in that country, which will last until June 15.

Saber Strike is a long-standing U.S. Army Europe-led cooperative training exercise that helps facilitate cooperation amongst the U.S., Estonia, Latvia, Lithuania, Poland and allied and partner nations.

This year's key exercise objective will be training and exercising the NATO Enhanced Forward Presence (eFP) battle groups with a focus on promoting interoperability with allies and regional partners and improving joint operational capability in a variety of missions.

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Read alsoPutin vows response to "eliminate threat" if Sweden joins NATO - mediaThe eFP battle groups stationed in Estonia, Latvia, Lithuania and Poland are part of the ongoing commitment by NATO Allies and Partners to deter aggression throughout Europe. NATO's Multinational Corps – Northeast (MNC-NE) will be featured as a command and control element for multinational operations.

Key training events of Saber Strike 17 will include: a convoy by Battle Group Poland from Orzysz, Poland, to southern Lithuania; a maritime prepositioned offload of pre-staged supplies and equipment in Latvia; a Marine amphibious assault in Latvia; two combined arms live fire exercises (one each in Poland and Lithuania); an air assault by the British Royal Marines at the Polish and Lithuanian border; and a river crossing in the same area.

Nations participating in the exercise include Belgium, Canada, Croatia, Denmark, Estonia, Finland, France, Germany, Italy, Latvia, Lithuania, Luxembourg, the Netherlands, Norway, Poland, Portugal, Slovenia, Slovakia, the United Kingdom and the United States.

The exercise will take place in multiple locations throughout Estonia, Latvia, Lithuania and Poland May 28-June 24.