That was because of Iran's TERRIBLE diplomacy under IR. Say what you will about the Shah, but he convinced the west to give Iran the F-14, the 1970's equivalent of the F-22 today. He also convinced the west to give Iran nuclear weapons on a silver platter.
Wanting to support various movements in Palestine and what not is one thing, but then opening your mouth to stand out and make yourself out to be villain no 1 is the worst thing any country could do. This was especially problematic during Ahmadinejad era.
An Iranian gas pipeline to Europe is very unlikely under this government. There are so many barriers and national boundaries to go over. Realistically if sanctions are removed Iran should push for the Iranian gas pipeline to Pakistan or if they don't want to take part, directly underwater to India.
India in a few decades will be the largest economy in the world with the largest population on earth. It would be a great investment. Just make them an offer they can't resist and make it happen. However before that the government in Iran needs to invest in its own infrastructure, specifically energy, mining and optimal power generation in the country. These investments will pay for themselves during the next few decades.
Honestly I think Iran has done more than enough and sacrificed more than enough for the various causes throughout the region. In the next few years Iran needs to focus on building its infrastructure and international relations, especially now with these Russian moves in Ukraine, it's the optimal time to do this, and especially if the JCPOA is revived Iran needs to scramble.
60% of Germany's gas is from Russia and that number is set to increase. Is it really wise for them to kick Russia out of SWIFT ? There will be a bounce back effect. Energy prices are already shooting up. Once Russia controls all of the worlds wheat it's going to be hopeless for anyone to mess with Russia too much.
Well there has been some shock and awe and I'm not sure what would impress you ? From Crimea they have made it 100 KM + into Ukrainian territory. They have destroyed all of Ukraine's air defense capability and airforce. Russians have also taken several key airfields/bridges/etc deep in Ukrainian territory. Paratroopers have been used and the Chernobyl area has also been secured already.
Honestly tell me, what would they have to have done by now to impress you ? In an alternate reality what would you have to have seen to say "I'm impressed!" ? ??