REUTERS

State Department spokesman John Kirby says six Ukrainian service members were killed and 33 wounded over the last two days in what he calls a "Russian-separatist attempt to seize additional Ukrainian territory," The Associated Press reported.

He says Russia is violating previous truce deals by supporting the rebels.

Read alsoFighting near Svitlodarsk: 1 KIA, 9 WIA in past 24 hoursKirby on Tuesday called on Moscow to pressure the separatists into stopping.

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He said Washington supports a "cease-fire recommitment" to provide greater security to Ukrainians on all sides.