Children walk by graffiti in a street in Sanaa, Yemen, March 3, 2020. Yemeni activists in Sanaa held on Tuesday a graffiti drawing campaign calling for peace and appealing to all Yemen's warring parties to sit on the negotiation table and work together to end the ongoing war. (Photo by Mohammed Mohammed/Xinhua)

A man draws a graffiti on the wall in Sanaa, Yemen, March 3, 2020. Yemeni activists in Sanaa held on Tuesday a graffiti drawing campaign calling for peace and appealing to all Yemen's warring parties to sit on the negotiation table and work together to end the ongoing war. (Photo by Mohammed Mohammed/Xinhua)

A man draws a graffiti on the wall in Sanaa, Yemen, March 3, 2020. Yemeni activists in Sanaa held on Tuesday a graffiti drawing campaign calling for peace and appealing to all Yemen's warring parties to sit on the negotiation table and work together to end the ongoing war. (Photo by Mohammed Mohammed/Xinhua)