The coronavirus is now spreading in Yemen, which announced its first case on Friday. Its an extremely alarming development in a country suffering the worlds worst humanitarian crisis. Thirty million mostly impoverished people have lost at least half their health care facilities since neighboring Saudi Arabia began a punishing military intervention there in 2015 with U.S. support.

The coronavirus news panicked Yemenis and aid groups already fighting mass hunger and a yearslong cholera outbreak. And it highlighted that while world powers like the U.S., Britain and France struggle with the novel coronavirus themselves, they bear significant blame for making places like Yemen especially vulnerable to the new global crisis. Those three countries have given extensive support to the Saudis and allies like the United Arab Emirates (UAE), risking complicity in war crimes, according to United Nations investigators .

Weve unfortunately played a role and have a moral responsibility to assist, said Rep. Ro Khanna (D-Calif.), part of a bipartisan group of lawmakers making the U.S. role in Yemen a top concern in Congress in recent years.

Under two U.S. presidents Barack Obama, who originally approved assistance to the Saudi-led campaign, and Donald Trump America has helped pummel Yemens critical infrastructure even as government experts watched the country collapse and sent hundreds of millions of dollars in U.S. aid there.

The Saudi-led coalition, whose weapons largely come from the U.S. and other Western producers, attacked at least 32 Yemeni health facilities between 2015 and the end of 2018, killing and injuring medical workers and putting units out of commission, per a recent report by Physicians for Human Rights and the Yemen-based group Mwatana for Human Rights. Until November 2018, the coalitions planes were also receiving U.S. aerial refueling that enabled longer bombing runs .