Hopey-changey pretty butterflies and pink unicorns and peace 'n love will not alter the fact that other nations pursue their power and money interests ruthlessly, are quick to deceive, and quick to to identify and exploit weakness.
A quote from Russia and Iran get Strategic, from FPIF:
Looking at the developments of the past 90 days through the filter of the new Russian security framework, a clearer picture emerges. It's no longer a question for the United States of whether or not Russia will support additional sanctions on Iran. That won't happen. Russia is on the path to make Iran a strategic partner, a counter to the United States in the regions of rivalry.
The United States falls into a trap in assuming that Russia doesn't want a nuclear- armed Iran. Russian officials repeat over and over that they have no evidence that Iran has a weapons program. U.S. officials discount that statement but shouldn't. The United States needs to remember that Russia has nuclear engineers inside Iran working with the Iranians.
Read the whole brief article. Lovely as Persian carpets may be, the Russians are after the oil and the geopolitical leverage, not pretty rugs. This is a game for big boys.