LyrArc Article Gist
Sabotage of two tankers in the Persian Gulf and reports of activity of Iranian proxy forces in Iraq and Syria have led to an American response with the dispatch of a aircraft carrier and other forces to the region. 

This report in the NYT says Defense Secretary Shanahan has prepared plans for deployment of American forces in the region with one plan calling for 120,000 troops to be dispatched to the region. As president Trump is against American involvement in land wars in distant places, the force is designed as a precaution in case of an Iranian attack through proxy forces in Syria or Iraq and not for a land operation. National Security Adviser Bolton has taken a strong position on Iran since the days of the Bush administration. The U.S. withdrawal from the Iran nuclear deal, the sanctions on Iranian oil, are part of a new policy of the Trump administration. The European Union countries have followed a policy of preserving the nuclear deal of 2015, even though the U.S. is pressuring EU countries.

The oil sanction have led to a sharp drop in oil exports and is hurting the Iranian economy. President Rouhani of Iran says Iran may withdraw from parts of the Iran nuclear deal and the Iranian response is leading to heightened tensions in the region. 

It was only recently that the Democratic party Obama administration pursued the Iranian nuclear deal with opposition from Republicans in Congress and skepticism of Israel. The election of president Trump who says the deal was a bad one has reversed U.S. policy leading to a complete change in policy and a possible confrontation with Iran.

U.S. policy can veer back and forth depending on the party or president in power who completely different perceptions of the region. Obama had sharp difference with Israel and Saudi Arabia, and a different perception of Iran. Trump and Bolton see Iran as a threat to the U.S.

After Iran shipped most of its nuclear fuel out of the country in 2016 in exchange for lifting of economic sanctions under president Obama's nuclear deal it would take over a year for new uranium enrichment facilities to produce the materials for a nuclear bomb, according to this report in the NYT. When the Obama administration negotiated with Iran the window had shrunk to a few months.