In the Ukrainian capital of Kiev, a bell rang 25 times Tuesday morning, marking each year that has passed since the world’s worst nuclear disaster. Many survivors of the 1986 Chernobyl accident are still suffering the after-effects, and the new nuclear crisis unfolding in Japan serves as another reminder of just how long recovery can take.

A short drive away from the Chernobyl plant stands a police checkpoint that guards the restricted area. Outside, it’s a beautiful part of Ukraine, with forests and fields. Inside, it’s still largely a wasteland.

Back in 1986, thousands of people crossed this very point on the road that leads toward the plant, ordered by the Soviet government to respond to the disaster that would spew radiation into the air and across Europe. They headed in — and were exposed.

Former firefighter Anatoly Kotlyar remembers driving to the plant like it was yesterday. Today, we call people like him first responders. At the time, the Soviet government called them liquidators. They fought fires, cleaned up and provided security.

Kotlyar led 19 men toward the crippled nuclear reactor as it burned.

“We didn’t know where we were going. We didn’t know anything about it. But we were proud to do something, because our motherland gave us an order, ordered us, and we were proud to fulfill this order,” he says.

A quarter-century later, no one knows what their heroism cost. It isn’t clear how many deaths and illnesses among liquidators can truly be linked to radiation exposure. Of the 20 men in Kotlyar’s fire brigade, four have died. One man had a brain tumor, another leukemia. Kotlyar is convinced at least that those two died because of radiation.

His fellow liquidator, 58-year-old Alexander Zenchenko, spent two weeks providing security at Chernobyl following the accident. He remembers doctors telling him it could take 25 years for radiation poisoning to show symptoms.

“When we first went to the hospital, they told us it would get worse and worse, and little by little it has,” he says. Zenchenko says he has a blood disease that requires frequent transfusions. Like so many other liquidators, he has been fighting his government for years to provide more money for his health care.

Certainly, from the start, the Chernobyl accident was downplayed. When fire broke out the morning of April 26, 1986, the Soviet government was gearing up for its annual May holiday that marks victory in World War II. It was a patriotic time that was not to be interrupted. And news coverage of Chernobyl suggested that things weren’t so bad.

According to reports, levels of radioactivity at the power station and in its immediate vicinity had been stabilized, and medical help was being given to victims.

But in the ensuing weeks, it became clear that the accident had altered the way of life in central Ukraine. Families would live forever with unanswered questions about their health.

In the summer of 1986, Alla Pugacheva, an iconic Soviet pop singer, visited Chernobyl and told people — for better or worse — that the nuclear facility would always be part of their world. She lifted spirits with her song “Druzay,” about how everyone has a hundred faithful friends.

That message has always echoed here. There is not much mobility in post-Soviet Ukraine. People still live in houses they built in Soviet times, so neighbors who lived through Chernobyl remain together today. They’ve all been watching news coverage of the nuclear accidents in Japan, and it has reopened some wounds.

Alexander’s wife, Yelena Zenchenko, says she has been struck by the Japanese government’s response to the crisis.

“They’ll find a way to protect their people,” she says. “Not like in our country, where people had nothing but their own resources. I do hope people in Japan overcome this sooner than we have.” Copyright 2011 National Public Radio. To see more, visit http://www.npr.org/.