WASHINGTON — The Novorossiya Humanitarian Battalion boasts on its website that it provided funds to buy a pair of binoculars used by rebels in eastern Ukraine to spot and destroy an armored vehicle. Another group, Save the Donbass, solicits donations using a photograph of a mortar shell inscribed with its web address and the names of donors. Yet another, Veche, states that its mission is to “create modern, combat-ready” military units fighting Ukraine’s central government.

These organizations are part of an online campaign that is brazenly raising money for the war in eastern Ukraine, using common tactics that have at least tacit support from the government of President Vladimir V. Putin of Russia. Although they often portray their mission as humanitarian, most of the groups explicitly endorse the armed insurgency and vow to help equip forces in the two regions at the center of the fighting, Donetsk and Luhansk.

An examination by The New York Times of the groups’ websites, social media postings and other records found more than a dozen groups in Russia that are raising money for the separatists, aiding a conflict that has killed more than 6,400 people and plunged Russia’s relations with the West to depths not seen since the Cold War.