Obama had removed every tank from Germany by the Spring of 2013. Additional cuts were in the offing and promises of a pivot to Asia, reset was the public and private goals of Hillary and Obama. Putin took advantage of that power vacuum. He took Crimea with his little green men, and he began a campaign of intimidation against neutral and NATO nations in Europe. Now, you can blame Lindsey and McCain, or you can blame Putin for making peace and security an issue.
Or blame Obama for being stupid in the first place. Lots of blame to go around.