With Russia still attacking their homeland, Vitaliy Mykolenko and Oleksandr Zinchenko embraced prior to the match.
The Ukrainian internationals spoke briefly and hugged with the City defender, who was upset at the time.
The club's players walked out with the Ukrainian flag draped over them, while the supporters held a banner with the words "We stand with Ukraine".
The City players lined up for the match wearing t-shirts with the message "No war" and the blue and yellow flag of Ukraine.
Football continued across Europe and there were more shows of support for Ukraine.
On the support of the crowd for the messages portrayed by the players, the Manchester City boss said: "What a moment." Thank you so much. He was very happy. He was getting warm. It means a lot to the people.
Thank you so much for the reaction. It was very emotional.
The power of sport has been seen in the last few days.
I know how much heart is in this club from owner to chairman to fans and we wanted to show that. Our fans and their fans came together because we have a player with Vitaliy on our side.
That is the unity of sport and a lot of people on the outside could learn from that as well.
Both teams and managers stood in front of a banner proclaiming the word "Peace" in many languages, including Russian and Ukrainian, prior to the Manchester United-Watford game.
The idea was embraced by both sets of players and clubs.
After scoring the opening goal for Villa in their 2-0 win at Seagulls, Cash put a message under his shirt for his teammate Tomasz Kedziora, who is still in Ukraine.
The message said "stay strong my bro." The defender was booked for his celebration.
There was a show of support for Crystal Palace during their draw with Burnley.
There was a minute's silence prior to the game between Eintracht Frankfurt and Bayern Munich.
The German football league announced that all top flight and second tier matches in Germany would indicate peace and sympathy with Ukraine.
There were a number of anti-war banners displayed during Real Madrid's win at Rayo Vallecano.
In France, the Paris St-Germain players posed with the Saint-Etienne players in front of a banner that said "Peace for all".
There was a sign with the horizontal blue and yellow bands that said "No War" as Empoli hosted Juventus.