Four Central European countries say they are working on a plan to deploy their troops in the Baltics states as part of NATO forces.

In a declaration signed Wednesday, the Czech Republic, Hungary, Slovakia and Poland say that their defense leaders will work out details of the plan to be presented at a NATO summit in Warsaw in July.

The troops from each of the four states should be available for a rotational deployment starting on Jan. 1. Their activities will focus on training and exercises.

The four countries form an informal grouping known as the Visegrad Group. They say they support an increased NATO presence in member states Poland and the Baltics, which feel threatened by Russia.