cautious

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Its cautious response suggests it is not convinced that will prove to be the case.

Uneasy Arab world gives Iran nuclear framework a cautious welcome

Saudi Arabia and the UAE fear Iran’s rehabilitation would ease its political and economic isolation and embolden its designs in the Arab world

https://www.theguardian.com/world/2015/apr/03/uneasy-arab-world-gives-iran-nuclear-framework-a-cautious-welcome#:~:text=Its%20cautious%20response%20suggests%20it%20is%20not%20convinced%20that%20will%20prove%20to%20be%20the%20case.%20