The Pentagon announced it was sending F-16 fighter-bombers and F-15 fighters to Poland and the Baltic States, as well as C-130 transport planes and RC-135 aerial tankers. In the case of Latvia, Lithuania and Estonia, this will result in an increase in NATO forces on Russia's northern border.
The USS Truxtun is an Arleigh Burke class destroyer armed with cruise missiles and anti-ship Harpoon missiles. Cruise missiles can carry a nuclear warhead. According to the U.S. Navy, the Truxtun's mission has nothing to do with the crisis in the Ukraine but is simply carrying out joint maneuvers with the tiny Romanian and Bulgarian navies.
It is unlikely that the USS Truxtun will go looking for trouble or that the F-15s and F-16s will play chicken with Russian MIGs and Sukhois, but mistakes happen, particularly when tensions are high. It is exactly the current situation that Gorbachev was trying to avoid back in 1990, and why NATO's relentless march east puts more than the Ukraine in harm's way.