Sigh. This is why I don't generally like to visit /r/worldnews or popular subs anymore. Too many users posting unabashed ignorance masquerading around as fact, supported by superficial blips of feelings and intuitions derived from bad sourced headlines.
I'll try to give your basically incoherent statements the benefit of the doubt when addressing them.
Russia and Iran are not long-term allies and never were. As I stated before, Russia uses Iran as a bargaining chip with the US and history backsup the statement.
Let's start with the obvious...
Why might Iran and Russia want to pursue stronger relations?
Russia and Iran do not like US hegemony
Iran likes Russia for not imposing human rights standards on Iran
Russia likes selling weapons to Iran
Russia and Iran formed a working agreement to deal with the Syrian conflict, given shared interests. Iran provided military access to Russia, only to turn around and revoke it. Bear in mind, this is only for refueling purposes, not to use Iranian military resources as a launching point for airstrikes or storing reserve units. Eventually, they formed a working agreement after Iranian's spent significant time debating it internally. This made it clear that Iran does not trust Russia.
But, Putin gave SL Ali Khamenei a special Koran, so they're all long-term friends... ok.
Let's think about why Iran does not trust Russia.
During WW2 the Soviet Union occupied a large chunk of Iran. The Allied forces excluding the Red Army held land but gave it up after WW2. The Soviet's held onto Iranian territory and established provinces until 1947 when American diplomats interfered, talking the Soviets into handing the land back to Iran. The American interjection of Russian occupiers helped foster a US-Iranian alliance, lasting to about 1979.
During the 1980s, the Soviets invaded Afghanistan and Iran condemned them for destabilizing their neighbor.
During the Iran-Iraq war, the Soviet's supported Iraq.
Around 1990, Soviet's started to form agreements with Iran to counteract US global presence and NATO, but they were all abandoned following the collapse of the Soviet Union in 1991.
Prior to the Putin-era in 1995, US-Russian diplomacy trumped Iran-Russian diplomacy as Russia agreed to halt conventional weapons sales to Iran
Russia did not veto sanctions on Iran in 2006 for uranium enrichment programs
Russia sold S-300 missile batteries to Iran in 2007. The systems were never delivered and canceled in 2010 due to the same sanctions they failed to veto on the UN Security Council. It was not until almost 10 years later and the Iran nuclear program passed that the systems started to reach Iran.
What is the overall take away?
Russia prefers better relations with the West and is willing to short-change Iran based on changing diplomatic climates with the West.
Russia perfers US-Iran tensions remain high to take pressure off US-Russia relations
Other factors why Iran and Russia are not allied, nor will they pursue stronger, long-term alliances
Russia is not a significant source of capital investment for Iran, so Iran cannot fully commit without slowing investment from the West.
The Russia-Iran agreement to work together on protecting Assad in Syria was undermined by the Trump's administration to work with Russia to iradicate ISIS. A strong departure from the Obama administration's strategy of arming Syrian rebels. Iran and Russia worked to support Assad, but now that Russia is getting what it really wants, access to Syria, Assad, and improved relations with the US.
Russia cannot allly with Iran, and subsequently the Shia Axis of Resistance, without obliterating relations with Sunni Muslim countries and Israel
Russia would sell Iran away without hesitating if it meant improved relations with the US. Syria and Assad were the binding forces for the brief resurrgence of improving Russia-Iran relations, but those forces are withering away.