Stocks were mixed on Tuesday after trading lower earlier in the session on pressure from Russia’s move to update its nuclear doctrine. The move lowered Russia’s threshold for using nuclear weapons.These stocks made moves Tuesday:Super Micro Computer surged 31% after the server maker late Monday appointed an independent auditor and submitted a plan with Nasdaq that it believes supports its request for an extension of time to regain compliance with Nasdaq listing requirements.

US stock futures fell Tuesday, weighed by heightened geopolitical tensions after Russian President Vladimir Putin issued a thinly-veiled nuclear threat to the US. Here are some of the biggest premarket US stock movers today: Walmart (NYSE:WMT) stock rose 3.