Next week sounds too late.
Check it out:

Congress is putting pressure on President Obama to immediately punish the Ukrainian government following the deaths of at least 25 people in overnight violence.

Both the House and Senate are considering new sanctions that could come up for a vote soon after Congress reconvenes next week.

Members of the Senate Foreign Relations Committee are putting together bipartisan legislation that has the blessing of the panel’s chairman. And the top Democrat on the House Foreign Affairs panel also called for “immediate action.”