Denmark funded the new Ukrainian-made, self-propelled artillery pieces that can drive at 50 mph and hit targets 35 miles away.

The head of NATO’s military committee says that Ukraine has the solid legal and military right to strike deep inside Russia to gain combat advantage, reflecting the beliefs of a number of U.S. allies.

Russian President Vladimir Putin has warned NATO alliance leaders that a move to lift restrictions on Ukraine’s use of longer-range Western missiles to strike deep inside his country would be considered an act of war.

The Russian president said Western support for Ukrainian strikes deep inside Russia would put his country and NATO “at war.”

Stoltenberg said the day the war was launched was the worst in his 10-year stint in the role, from which he is stepping down next month.

And that right doesn't stop at the border of your own nation," said Admiral Rob Bauer, speaking at the close of the committee's annual meeting, also attended by U.S. Gen. CQ Brown, chairman of the Joint Chiefs of Staff.