Both Russia and China are promoting alternatives for the suez canal ( arctic route and BRI) . For them any tension in the red sea is a win win .. for China maybe a win lose . Ironically it is us that are most effected by this .Escalating with Yemen is pointless since Houthis are nothing more than Khamenei's disposable assets. Even if an invasion force could neutralize every single Houthi (difficult and bordering genocide), it would mean that the Iranians could pick some other tribe and start their covert war again whenever needed.
If this escalates to a point where global trade is threatened, especially for the Middle East, India and China, these countries will take collective action against Iran apart from the entire European Union who would ditch Ukraine in a jiffy to save their jugular vein. Russia might oppose in principle but will stay silent if a collective military force were to strike Iran for these reasons.
That is not something that the Iranians can handle.
Seems more like speculation. 12 Su-30 MKI are already being considered for EW and dubbed "Growlerski". This conversion will happen along with the rest of the Super Sukhoi upgrades.
To be pedantic Singapore Japan and Korea are even more effected but they have uncle's hand on their head.