By Catarina Demony, Francesco Guarascio and Ali Kucukgocmen ISTANBUL/MADRID/BRUSSELS (Reuters) -Russian billionaire Roman Abramovich jetted into Moscow on Tuesday as the Spanish government seized more assets belonging to Russia’s rich and the EU banned exports of caviar and luxury goods. Abramovich landed in Moscow early on Tuesday after taking off from Istanbul in his private jet, according to FLIGHTRADAR24 data. A source familiar with the matter said he was not in Russia to meet with President Vladimir Putin. It was the second trip a jet linked to the oligarch has made between the Turkish ci…