TORETSK, Ukraine (AP) — Russia pounded eastern and southern Ukraine on Tuesday as the U.S. promised to "keep moving heaven and earth" to get Kyiv the weapons it needs to repel the new offensive, despite Moscow's warnings that such support could trigger a wider war.

For the second day in a row, explosions rocked the separatist region of Trans-Dniester in neighboring Moldova, knocking out two powerful radio antennas close to the Ukrainian border and further heightening fears of a broader conflict erupting across Europe. No one claimed responsibility for the attacks, but Ukraine all but blamed Ru...