European equity markets were poised to open flat to slightly lower on Tuesday, as investors awaited clearer signals on the US-Iran peace agreement and a series of key central bank decisions scheduled for this week. The interim accord is expected to be signed in Switzerland on Friday, with President Donald Trump indicating that once the deal takes effect, the free flow of oil from the Persian Gulf will resume. At the same time, several European central banks — including those of the UK, Switzerland, Norway, Sweden, and Russia — are due to announce their latest monetary policy decisions. On the data front, investors will be watching the ZEW Economic Sentiment Index releases for Germany and the Eurozone later today. In premarket trading, Euro Stoxx 50 and Stoxx 600 futures were broadly flat to slightly lower.