The crisis in Ukraine has reached an impasse. The cease-fire signed in Minsk, Belarus, in September never really took hold, but at least it provided a cover for efforts to reduce the level of fighting and focus on stabilizing and reforming the Ukrainian economy as a prelude to a serious, long-term search for a resolution of the crisis. Now even the fig leaf of cease-fire is gone. Russian armored vehicles are rolling into eastern Ukraine — disowned, of course, by Moscow.

Gunfire is exchanged constantly in and around Donetsk, and Kiev has basically disowned residents of territories claimed by separatists by cutting most government services, benefits and pensions. And though elections to the Ukrainian Parliament on Oct. 26 brought in a new, pro-Western legislature, Kiev is still far from forming a government or producing a viable program of reforms.

The United States and the European Union have made clear, and correctly so, that they hold President Vladimir Putin of Russia largely responsible for this state of affairs. He was snubbed at the Group of 20 meeting in Brisbane, Australia. Then Chancellor Angela Merkel of Germany, once the European leader deemed most cautious in relations with Moscow, assailed him for reviving a Cold War atmosphere 25 years after the Berlin Wall fell.

There is no question that by annexing Crimea and arming separatists in eastern Ukraine, Mr. Putin has done great damage to East-West relations — and to his country, which finds itself isolated and in economic trouble. The decision on Monday by the European Union to add more separatist leaders to the list of Mr. Putin’s allies barred from Europe may be largely symbolic, but along with the cold reception in Brisbane, it does let the Russian leader know that the West is not about to let him off the hook.