washington friday speech lay strategy toward iran decision certify comply 2015 nuclear agreement u.s. president donald trump make series statements analysts question trump say might terminate deal iran agree curb dispute nuclear program return lift economic sanction lay aggressive approach counter iran ballistic missile program support militant group trump controversial comment along analysis basis fact trump previous administration lift sanction would total collapse iranian regime deeply controversial 2015 nuclear deal iran several foreign policy analysts say reason believe government iran whose economy suffer economic sanction target oil industry close fall apart evidence aware would suggest regime verge collapse say michael singh expert washington institute near east policy serve republican president george w. bush national security council staff sanction pretty strong impact iranian economy especially oil sanction real contraction iranian economy say say anything beyond matter speculation fact singh argue pressure bring tehran international sanction could actually help unite factions within iran thereby strengthen rulers trump nuclear deal throw iran dictatorship political economic lifeline provide urgently need relief intense domestic pressure sanction create also give regime immediate financial boost 100 billion government could use fund terrorism 100 billion fact already belong iran represent foreign assets block sanction unfreeze lift international sanction deal formally call joint comprehensive plan action jcpoa experts say tehran would see fraction sum debts owe include 20 billion china infrastructure project various estimate put actual amount tehran receive 60 35 billion addition roughly 1.7 billion hand iran stem uncompleted arm deal unite state government late shah pay 400 million deposit topple iran 1979 revolution remain 1.3 billion represent interest owe 400 million accord u.s. officials use money leverage obtain release five u.s. citizens hold iran obama administration repay deposit pallets cash deliver aircraft iran make multiple violations nuclear deal trump iranian regime commit multiple violations agreement example two separate occasion exceed limit 130 metric tons heavy water recently iranian regime also fail meet expectations operation advance centrifuge international atomic energy agency iaea u.n. nuclear watchdog charge monitor deal say tehran full compliance judgment trump administration twice previously affirm nuclear-related commitments undertake iran jcpoa implement present iran subject world robust nuclear verification regime iaea director general yukiya amano say statement trump speech iran exceed 130-metric-ton cap heavy water stockpile run advance centrifuge devices purify uranium permit deal arguably exceed limit low-riched uranium supply experts say iran quickly correct infractions importantly argue iran commit deal-rupturing material breach multiple violations exaggeration actual violations say robert einhorn nonproliferation expert work state department former president barack obama brook institution think tank seek exploit ambiguity text unite state push back reasonable outcome reach every case say factbox trump assertions iran question experts