Timing is interesting.
The formation of the Visegrad 4 Battle Group seems to have awakened the United States to its own relative distraction from Eastern European allies.
Poland, which has been asking for American "boots on the ground" (if for no other reason than as a symbolic stand that the United States will defend Poland from Russia), finally extracted a pledge from President Obama, who will be visiting Saturday.
The US will be placing aircraft and trainers in a Polish base to beef up the Polish air force. The president has also assured the US commitment to the NATO precept: mutual defense.
The fact that President Obama needed to make this reassurance to an ally that was staunchly secure during the Bush years is a sign that the US has begun to recognize its poor attention to the area. It's also a sign that the V4 is being taken very seriously, and immediately.