Looks like Iran is gonna fight Israel + US/NATO alone, Putin says the strategic partnership with Iran didn't include defence, and Iran didn't request any help from Russia at this time. There are unverified rumours (flight tracker) of at least two Chinese heavy transport air crafts flying into Iran since the hostilities started, again unverified. Don't think China will enter this, maybe just some behind the scenes intelligence help for Iran.
big difference between US-NATO and China-Russia in this conflict. US-NATO has clearly defined who their ally is (Israel) and who the enemy is (Iran), whereas China-Russia wants to maintain good relations with Israel after this conflict.