Vitaly Shevchenko

made out of pre-fabricated concrete panels, known as panelki, or smaller five-story blocks of flats, known as khrushchevki, after Nikita Khrushchev, the Soviet leader who oversaw their construction in the 1950s and 60s.

They all need heating to be supplied from outside.

Heating plants, known as TETs in Ukraine, are huge, and when they're targeted by Russia, this affects many thousands.

The authorities say that all such power plants have now been hit.

Yuri Korolchuk is a Ukrainian energy expert.

For security reasons, Kyiv's local power company will not say exactly how many residents rely on communal heating.

In the frontline city of Zaporizhia, it's almost three quarters.

The Ukrainian government is acutely aware of this vulnerability, but undoing decades of Soviet urban planning will not be quick or easy.

I think, Celia, it would be helpful to try and cut through the rhetoric that we have been hearing from politicians in Washington, in Kiev and Moscow.

And I think this plan, it largely boils down to the possibility that Russia and the United States

are successful or may be successful in forcing Volodymyr Zelensky to give up land in exchange for a pretty vague promise of a ceasefire.

And looking at the security guarantees mentioned in that plan, they are hardly rock solid.

And other provisions in the plan, they will never be accepted by Russia.

Things like the deployment of a foreign force, maybe a military force, to monitor that ceasefire.

Russia has rejected that idea consistently.

So at the end of the day, are we...

any closer to the end of hostilities in Ukraine, that is very unlikely still.

And even if it happens, it will not happen on Ukraine's terms.

It will happen on Russia's terms, supported by the United States, if this plan were to go ahead.

Well, the two trends of thought that I have detected coming from Ukraine are pretty clear.