Ukrainian Marta Kostyuk has refused to shake the hand of her Belarusian opponent Victoria Azarenka after their second-round match at the US Open.

Kostyuk has been the most vocal critic of the lack of condemnation from Russian and Belarusian players in the face of the invasion of her country.

After Azarenka’s 6-2 6-3 victory, 20-year-old Kostyuk did not offer her hand to her opponent, but instead held out her racquet for a cursory tap.

“I just don’t think it’s the right thing to do in the circumstances I’m in right now,” explained Kostyuk afterwards.

“I don’t know any single person who condemned the war publicly, and the actions of their government so I don’t feel like I can support this.

“We had a great match, don’t get me wrong. She’s a great competitor, I respect her as an athlete, but that has nothing to do with her being a human being.

“People who didn’t watch the match will probably slam me and tell me, ‘She’s such a bitch, thank God Vika beat her, she talks too much, and it was a fair score’. But it was honestly a super close match.”

Kostyuk singled out Azarenka because of her profile and role on the WTA Player Council and believes she should have made more of an effort to speak personally to Ukrainian players.

Azarenka, though, insisted she has offered help and support, saying: “I’ve offered many times through WTA, because I believe there is a sort of sensitivity. I’ve been told that that’s not a good time.

“I never had a close relationship with Marta. In March when everything happened, I have reached out to all the [Ukrainian] players that I personally know and I still have a good relationship with.

“I don’t feel that forcing myself to speak to somebody who maybe doesn’t want to speak to me for different reasons is the right approach. But I offered.

“I feel like I’ve had a very clear message from the beginning, is that I’m here to try to help, which I have done a lot. Maybe not something that people see. And that’s not what I do it for.

“I do it for people who are in need, juniors who need clothes, other people who need money or other people who needed transportation or whatever.

“If Marta wants to speak with me – she texted me yesterday, I replied. I’m open to any time to listen, to try to understand, to sympathise.

“I know she’s going through a lot of difficult situations. It’s not easy to handle. From my perspective, I wish she had somebody who guided her a little bit better.”

Kostyuk had wanted to meet Azarenka on Wednesday to explain she would not shake her hand but the players were not at Flushing Meadows at the same time.

On the lack of handshake, Azarenka said: “I wasn’t surprised. I always shake hands with my opponents. I had the same situation with [Ukrainian Dayana] Yastremska in Washington. I just move on.

“I cannot force anybody to shake my hand. It’s not the most important thing in the world right now.”