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It isn't confirmed about Pushilin btw
Oh yes it means "Tie a yellow ribbon" (Zav'yazhi zhovtu strichku)
Early on after the capture of Kherson city by Russia, locals started tying yellow ribbons to trees as a sigh of resistance and as a symbol that one day soon it would be liberated again. So it's in solidarity with that.
It turns out that the Ukrainians have done a number on the enemy by making a fuss about Kherson, getting the Russians to take reinforcements from Donbas to there - and struck unexpectedly in a massive pincer movement, surrounding thousands of Russian troops in SE Kharkiv.
Russia has called an emergency meeting of the UN security council, and their representative is complaining - in all seriousness - about the deceit of the above. You could not make this stuff up.