It would be a real stretch to think that "Vlad" and the PRC were afraid to engage in military adventures for fear that Bush would declare war on their countries.
Anyway, Bush was too busy invading nations himself to worry about what Russia might have been doing.
I remember ... when I was in the service, I was in charge of a group of people, and I was having trouble getting things done, much less done right. Finally, an old NCO pulled me aside and told me this: "The military has given you a big stick (court martial, etc.), but if your troops know you'll never swing it, you have no stick at all, just a piece of wood." I used it once, and all the disciplinary problems went away. Funny how that worked ...
Whether we like to admit it or not, we ARE the big dog ... we have the military power, the fiscal power, and the political power to impose our will on any situation, large or small. So, the question isn't "CAN we makes thing different?", the question is "Do we WANT to make things different?"
CAN we make a difference in the Ukraine? Sure - sign a mutual defense agreement with Ukraine, put a missile defense system in Poland, escalate the readiness of our troops in Germany - all signs that we are willing to 'swing the big stick'. Couple that with real, and substantive, economic sanctions, let it be known that we have updated our war plans to include Russia's oil refineries (obviously, they are already on the list), and the whole problem goes away.
CAN we make a difference in the Gaza strip? Sure - discontinue our aid to the Hamas-controlled government, take real and substantive action to provide assistance to the Palestinian people (with a clear understanding that it will stop if Hamas is not evicted), take a clear and consistent position of providing real military support (weapons, etc.) to Israel, pressure those Arab countries sitting on the sidelines to force Iran to stop support of Hamas/Hezbollah. In this case, our 'big stick' isn't military - it's economic. Use it or lose it.
CAN we impact the Middle East? Sure - but that's a military solution. Simply - take control of the region - conquer Syria, Libya, Iraq, Iran, and Afghanistan. Put forth the resources necessary to do the job. Establish governments in each country - allow them to define their own future, but monitor and influence, as necessary. The only problem is - war is a dirty business. People die - innocent people die.
So, let's not talk about what we CAN do ... let's talk about what we WANT to do.
Some among us, myself included, believe we have a higher responsibility than to cater to our own self interests. We have a responsibility to help others to realize the dream of freedom, to reach the pinnacle of self determination that we have scaled. Our history is replete with examples of our assistance to others, not for the purpose of self aggrandizement or gain, but rather, in search of the belief that all men those oft-quoted inalienable rights, and that we, as the recipients of those rights, have a responsibility to help others to secure them.
Others, primarily our liberal left, believe that we have no business meddling in others affairs - that, if they want freedom, they have to earn it all by themselves. They do not believe that we have this responsibility to aid those who seek self determination.
Our government has forgotten our larger purpose, and now, only concern themselves with themselves. They no longer care what is 'right', but merely what will perpetuate their power. Their only interest is their own self interest.
The only question is ... how long are we going to let them get away with it?