Advanced Arms Embargo to Iran expired last night, per Morgan Ortegus -Former State Dept Spokesperson. THAT may be why Iran tweeted "Time Is Up"
https://www.cbc.ca/news/world/iran-arms-embargo-expire-1.5767144
A decade-long United Nations arms embargo on Iran that barred it from purchasing foreign weapons, such as tanks and fighter jets, expired Sunday as planned under its nuclear deal with world powers — despite objections from the United States, which insists the ban remains in place.
While Iran says it plans no "buying spree," it can now in theory purchase weapons to upgrade military armaments dating back to before its 1979 Islamic Revolution and sell its own locally produced gear abroad.
In practice, however, Iran's economy remains crippled by broad-reaching U.S. sanctions, and other nations may avoid arms deals with Tehran for fear of American financial retaliation. The Trump administration has warned that any sales of weapons to Iran or exports from Iran will be penalized.