Ukraine's Marta Kostyuk recently took to Instagram to voice her opposition to Russia's strong-arm tactics against her nation.Russian President Vladimir Putin announced on Tuesday that his regime has recognized the independence of the Ukrainian regions of Donetsk and Luhansk. This sparked widespread furor around the world, with countless nations slapping Russia with sanctions and some indirectly threatening stricter measures.Governments and leaders across the world have pointed out that Putin has not only broken multiple international treaties with such a move but has blatantly disregarded the Minsk Agreement.Ukrainians who have been living in fear of war for several weeks are incensed at Putin's attempts to take control of their nation. World No. 54 Marta Kostyuk is one among them. She reposted a pro-Ukraine post on her Instagram Stories, strongly throwing her weight behind her nation's history and saying that Ukraine "will never be" a part of Russia."Ukraine has its own History. Ukraine has its own Culture. Ukraine has its own Language. Ukraine has its own Nation. Ukraine has its own Territory. Ukraine is a sovereign Country. Ukraine is not a "part of Russia," it wasn't and will never be," the post read.Diego Barbiani@Diego_BarbianiMarta Kostyuk shares a message on her Instagram stories: Ukraine is not a "part of Russia", it wasn't and it will never be6:43 AM · Feb 23, 202216823Marta Kostyuk shares a message on her Instagram stories: Ukraine is not a "part of Russia", it wasn't and it will never be https://t.co/pd3i6q0H3yMarta Kostyuk's compatriot Elina Svitolina retweets pro-Ukraine posts on Twitter, Martina Navratilova voices her concern for SvitolinaElena Svitolina at the 2019 Qatar OpenKostyuk's compatriot Elina Svitolina took to Twitter to make her opinions known regarding the ongoing Ukraine-Russia conflict. She retweeted a couple of pro-Ukrainian posts, making it clear that she does not stand for Russia's ploy to invade her nation.Ukraine / Україна@Ukraine#StandWithUkraine : @dorosh_raw4:13 AM · Feb 22, 2022113312724#StandWithUkraine 💛💙🎥: @dorosh_raw https://t.co/5Cq7qbPCueUkraine / Україна@Ukraine#StandWithUkraine 12:03 PM · Feb 14, 202295821332#StandWithUkraine 💛💙 https://t.co/eT62TDTqOyAmerican legend Martina Navratilova, meanwhile, took to Twitter a few days ago, expressing concern for Svitolina."I cannot imagine how terrified Elina Svitolina must be these days... fingers crossed for Ukraine," wrote Navratilova.Martina Navratilova@MartinaI cannot imagine how terrified Elina Svitolina must be these days… fingers crossed for Ukraine!!!1:18 AM · Feb 19, 2022214489I cannot imagine how terrified Elina Svitolina must be these days… fingers crossed for Ukraine!!!Marta Kostyuk & Elina Svitolina knocked out of Qatar OpenElina Svitolina prepares to serveMarta Kostyuk and Elina Svitolina appeared in the Qatar Open, where they fell in the first round, losing to Ana Konjuh and Tereza Martincova respectively.The teenager navigated past a couple of qualifying rounds, beating Claire Liu and Murbaka Al Naemi en route to the main draw. Kostyuk lost 4-6, 7-5, 6-3 against Konjuh.Elina Svitolina, meanwhile, fought tooth and nail against Martincova but eventually succumbed to a 6-7(2), 7-5, 7-6(5) defeat.