The long-awaited, and feared, delivery of Russian S-400 missile systems to Turkey has started. In spite of US and European warnings that Ankara should reconsider the Russian arms deal, to prevent economic and possibly military sanctions, Turkish president Erdogan has put his foot down. At a Turkish airbase next to Ankara, the Turkish army has received a first batch of S-400 parts. Turkey’s Ministry of Defense has stated. The coming days new deliveries are expected, threatening not only a possible more hawkish military stance by Turkey in…