Iran is committed to its obligations under an international nuclear deal despite the US withdrawal from the landmark agreement, Foreign Minister Mohammad Javad Zarif said on Thursday, describing the reimposition of US sanctions "unacceptable". Zarif made the comments in a meeting with Japanese Foreign Minister Taro Kono in Tokyo, adding that Tehran is exercising "maximum restraint in spite of the fact the United States withdrew from the Joint Comprehensive Plan of Action (JCPOA) signed in 2015 last May. For his part, Kono said it was essential to maintain the nuclear agreement and urged Iran to keep implementing it, Reuters reported. US President Donald Trump withdrew the United States from the JCPOA and is ratcheting up sanctions on Iran to strangle its economy.