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When French President聽Fran莽ois Hollande arrives in Washington Tuesday, he will meet with an American president well versed in all the reasons not to join France's efforts to聽"intensify" military action against the Islamic State. President Obama's two terms have been about extricating the United States from military entanglements abroad.聽

But Mr. Hollande will also have one obvious and overwhelming point in his favor: The equation under which the Obama administration has been operating has changed.聽

The question of what precisely聽鈥渋ntensify鈥� might mean is an open one that runs the spectrum from stepped-up airstrikes to more US military boots on the ground. What is much clearer is the fact that the Paris attacks have recast how the West views the Islamic State, also known by the acronym ISIS. The group has graduated from local bully to international terrorist syndicate faster than most expected.聽

The attacks are 鈥渇orcing us all to question the assumptions we made when we first started putting together the ISIS strategy which was: We have time,鈥� said Derek Chollet, assistant secretary of Defense for international security affairs from 2012 to 2015, in a discussion聽Monday聽at the German Marshall Fund.聽

The idea was that containing the Islamic State would take 鈥渁t least three years,鈥� he added. 鈥淭he question we all must face is whether we鈥檝e got three years.鈥�

As a result, 鈥淚 could see us dialing up the level of risk we鈥檙e willing to take,鈥� Mr. Chollet said.聽

Already, French airstrikes have hit Raqqa, Syria, the Islamic State's self-proclaimed capital. Hollande's goal in coming to the United States is to knit together a robust international coalition for a war against the Islamic State. He will fly to Russia later this week.聽

What the US role in such a coalition might look like is a matter of debate.聽

On one hand, former Ambassador to Iraq and Turkey聽James Jeffrey, said聽US should be 鈥渇ar more aggressive鈥� in its airstrikes. Moreover, the US should use ground troops to 鈥渢ake on major concentrations of ISIS forces, because I don鈥檛 think others can,鈥� he told the German Marshall Fund gathering. Such forces will 鈥渕ark our commitment to this battle.鈥澛�

But Chollet said the US has shown its commitment to the region with thousands of US boots on the ground in Iraq training local forces, as well as dozens of US special operations forces in the region.聽He said he could imagine increasing the number of US special operations forces to the 1,000-to-2,000 range.

The question remains 鈥渉ow close we will let them get to the fight [and] what sorts of risks are we willing to run.鈥�

Obama has questioned what such moves could actually accomplish.

鈥淔olks want to pop off and have opinions about what they think they would do,鈥� he said. 鈥淏ut what I鈥檓 not interested in doing is posing or pursuing some notion of American leadership or America 鈥榳inning鈥� or whatever other slogans they come up with that has no relationship to what is actually going to work to protect the American people, and to protect people in the region who are getting killed.鈥澛�

Indeed, civilian lives are at stake, too, and their future could affect American security. Intensifying US efforts could involve 鈥渙ur willingness to risk more civilian casualties in our airstrikes,鈥� Chollet said, noting 鈥渢here are many airstrikes that weren鈥檛 taken because of our fear of civilian casualties.鈥�

So far, US forces have gone to great lengths to avoid civilian casualties. Last week, for example, US military pilots dropped hundreds of leaflets telling drivers, who are generally not affiliated with IS, to 鈥済et out of your trucks and run away鈥� before bombing them.

There is a moral obligation to limit civilian casualties, but practical reasons, too. 鈥淚f you do hit a set of oil trucks without alerting the drivers in the area, you鈥檙e going to create enemies for life,鈥� said Mr. Jeffrey, who served in Turkey from 2008-10 and Iraq from 2010-12.聽

The problem, he added, is that 鈥渨e are hated in much of the Middle East by much of the population, and with or without us doing things on the ground, they鈥檙e going to look at those planes and assume that we鈥檙e deliberately trying to kill as many of their fellow Muslims as possible.鈥澛�

So risking more civilian casualties might not 鈥済enerate many more problems than we have now,鈥� he said.聽

Besides, there is a law of proportionality, Jeffrey said. The Islamic State is terrorizing upwards of eight million innocent people in Iraq and Syria. 鈥淚n the long run, proportionally you鈥檙e going to have a lot fewer civilians dying than you will in very carefully orchestrated air strikes.鈥�

These are difficult questions for Obama. He聽has been deeply shaped 鈥渂y the hand he inherited in 2009, and the sense that the US was on an unsustainable path in Iraq and Afghanistan,鈥� said Chollet.聽鈥淗e鈥檚 determined not to turn over to his successor, whomever he or she may be, a similar bad hand.鈥�