Russia is expanding by invading sovereign countries and the west should respond to this.
No doubt about that. And the response needs to be very firm, clear and of military basis.
But I would think the US and NATO could do that without violating the agreement.
If the post-1999 countries need equipment and/or training, we should provide as much as they can absorb. We should also fortify the pre-1999 countries with US Men and Assets.
Some rumblings in the press about the potential reactivation of a modern Pershing II, Nuked Waverider...even MX and "Rods from God" would also be helpful.
But with Obama in the White House we get a single US tank Battalion stationed someplace like Latvia...with no back-up.