I learned about it from a friend and a leading Ukrainian climber Mikhail Fomin, who thanks his friends for his challenge and courage from the shelled Kiev on his FB profile.
Here is the text of the call:
Нет войне. Обращение россиян
ДРУЗЬЯ,ЭТО МОЖНО СКОПИРОВАТЬ, РАЗМЕСТИТЬ НА СВОЕЙ СТРАНИЦЕ И ПОДПИСАТЬ. ОБРАЩЕНИЕ РОССИЯН
"Соотечественники!
Начавшаяся война России против Украины – это ПОЗОР.
Это НАШ позор, но, к сожалению, нести ответственность за него придется еще и нашим детям, поколением совсем юных и не родившихся еще россиян. Мы не хотим, чтобы наши дети жили в стране-агрессоре, чтобы они стыдились того, что их армия напала на соседнее независимое государство. Мы призываем всех граждан России сказать НЕТ этой войне.
Мы не верим в то, что независимая Украина представляет угрозу России или любому другому государству Мы не верим в заявления Владимира Путина о том, что украинский народ находится под властью “наци///тов” и нуждается в том, чтобы его “освобождали”. Мы требуем прекратить эту войну!"
And its translation:
No war. The appeal of the Russians
FRIENDS, IT CAN BE COPYED, POSTED ON YOUR PAGE AND SIGNED. APPEAL OF RUSSIANS
"Compatriots!
The outbreak of the war between Russia and Ukraine is a SHAME.
This is OUR shame, but, unfortunately, our children, a generation of very young and unborn Russians, will also have to bear responsibility for it. We do not want our children to live in an aggressor country, so that they are ashamed that their army attacked a neighboring independent state. We call on all citizens of Russia to say NO to this war.
We do not believe that an independent Ukraine poses a threat to Russia or any other state. We do not believe in Vladimir Putin's statements that the Ukrainian people are under the rule of “Nazi///” and need to be “liberated”. We demand an end to this war!"
Facebook of Mikhail Fomin:
Registration
lezec.cz
The Russian mountaineering server mountain.ru has published a call to end military operations in Ukraine, stating that it is a disgrace to Russia and its citizens for several generations.
Adam Ondra published a call to support the People in Need organization, which can quickly help the Ukrainian people suffering from the war. He wrote on social networks: 
Aneta Loužecká succeeded at the North American Ice Climbing Championships this weekend in Ouray, Colorado. She was 3rd in speed and 5th in difficulty, she said on Facebook. 
DryToolCup Brno 2021, ie the international Czech championship in ice climbing on lead and at the same time the 3rd race of the European Cup in ice climbing 2021/2022 was won yesterday by Tyler Kempney from the USA and Finn Enni Bertling. The best of ours was Aneta Loužecká 4th.
Czechs Zdeněk Háček Hák and Jakub Kácha climbed the direttissima west wall of Ama Dablam (6812 m). Yesterday they descended to the second altitude camp of the normal route and today to the base camp. They climbed a direttissima west wall called American Direct, which was first climbed in 1990, as specified by Háček's sponsor Climbing Technology CZ this afternoon. 
Adam Ondra and Eliška Adamovská won the Czech Republic lead climbing championship in Brno today. The second were Martin Stráník and Michaela Smetanová, the third Šimon Potůček and Nikola Králíková. 
Rishat Khaibullin and Tereza Cibulková won the Czech Republic Speed Climbing Championships in Brno yesterday. Kazakh Rishat Khaibullin set a time of 5,682 seconds in qualifying, which is only a few tenths of the world record (it is 5,208 s and is held by Indonesian Veddriq Leonardo from this year's World Cup in Salt Lake City). 
The two Czech climbers Jakub Vlček and Petr Macek, who got stuck in Pakistan after climbing Rakaposhi and the subsequent action to save them, "are returning home after difficult negotiations", Czech Foreign Minister Jakub Kulhánek said on Twitter a moment ago.
Adam Ondra and Eliška Adamovská won today the Czech Bouldering Championship in Slaný. The second were Martin Stráník and Michaela Smetanová, the third Štěpán Volf and Markéta Janošová.
Martin Stráník finished tonight at the 4th place in the finals of lead climbing on the World Climbing Championships in Moscow. Eliška Adamovská finished 9th in the semifinals. Austrian Jakob Schubert and South Korean Seo Chaehyun won. In second place were Slovenian Luka Potocar and American Natalia Grossman, in 3rd place were British Hamish McArthur and Italian Laura Rogora. 
