Tonight on PBS News weekend, Ukraine comes under pressure as U.S. and Ukrainian officials

meet in Switzerland to discuss plans to end the war with Russia.

Then as the Trump administration pushes for more arrests of migrants, we explore how federal

agents are escalating their tactics.

And deep in Brazil's Amazon rainforest, scientists have built a time capsule to predict the future of climate change.

From these towers, we will release CO2 into the treetops and try to create the atmosphere of the future there.

Then we can study all the

ecological processes that will be altered with more carbon in the system. Good evening. I'm Ali Rogan. John Yang is away. A full court press in Geneva tonight,

as U.S. officials put the heat on Ukraine to accept a peace deal. Who authored the plan became a point of contention,

while President Trump said Ukrainian leadership had expressed zero gratitude for American efforts.

Nick Schiffran has more on the diplomatic efforts spanning oceans.

Today in Geneva, a meeting that could help determine Ukraine's fate and what Secretary

of State and National Security Advisor Marco Rubio described as substantial progress.

It is probably the most productive day we have had on this issue, maybe in the entirety

of our engagement, but certainly in a very long time.

The Ukrainian delegation led by presidential chief of staff, Andrei Ermak, used the same

language.

We have very good progress, and we are moving forward to the just and lasting peace.

The U.S.'s 28-point plan presented last week would cap the size of Ukraine's military

and block NATO from sending any troops to Ukraine.

Ukraine would also have to give up the portion of the Donetsk region it still controls,

handing Russia control over the entire Donbass, which the U.S.

...