Russia-Ukraine updates: US sanctions Russian military shipbuilder, diamond miner

Ukraine and Russia have agreed to hold a new round of in-person peace talks, in Turkey this week, in a sign of some possible progress.

A member of Ukraine's delegation said the talks would take place March 28-30, while Russia's lead negotiator said they wouldn't start until March 29.

The two sides have been talking every day by video conference, officials said.

David Arakhamia, a member of the Ukrainian parliament and part of the country's delegation negotiating with Russia, wrote on Facebook that in the last video discussions with his Russian counterparts, the parties agreed to meet in-person.

Previous in-person peace talks were held in Belarus.

Ukraine is insisting on security guarantees from western countries in any deal, with its lead negotiator telling a German newspaper over the weekend that such guarantees "don't make sense" without the involvement of the United States.

-ABC News' Patrick Reevell

Sixty tons of food and relief items have arrived in the bombed-out city of Kharkiv in northeast Ukraine, according to the International Committee of the Red Cross.

The badly needed humanitarian aid arrived on Saturday and includes food, water and essential hygiene items, ICRC officials said. The Ukrainian Red Cross will distribute the supplies to residents in the war-torn area, many taking shelter in the city's metro station.

Maxime Zabaloueff of the ICRC said the aid will go to help "the people who have suffered the terrible consequences of the shelling on this city."

The ICRC is boosting its humanitarian response in Kharkiv, Kyiv, Poltava, Dnipro, Odessa and other areas across the country to address a growing humanitarian crisis, Zabaloueff said.

The ICRC has also dispatched more than 140 additional staff to the region, including surgeons and other medical workers, psychologists, weapon contamination specialists and engineers.

At least 139 children have been killed since the Russian invasion of Ukraine began on Feb. 24, the Ukrainian Prosecutor General’s Office said.

Another 205 children have been injured, the office said on Sunday.

Russian forces in northern Ukraine have been “largely static,” as Ukrainian resistance and counterattacks have been “hampering” their attempts to reorganize, the UK Ministry of Defence said on Sunday.

“Russian forces appear to be concentrating their effort to attempt the encirclement of Ukrainian forces directly facing the separatist regions in the east of the country, advancing from the direction of Kharkiv in the north and Mariupol in the south,” the Ministry’s update said.