"They are growing, I would say. We don't know what Putin has in his mind and what would be his decision," Deshchytsya told ABC's "This Week" political talk show, referring to the Russian president.
"That's why this situation is becoming even more explosive than it used to be a week ago," the Ukrainian foreign minister added.
The remarks were broadcast a day after Russian forces used armored personnel carriers and stun grenades to break into the Belbek airbase near Simferopol, the main city on the Crimean peninsula.
"The problem is that Russians, and particularly Putin's administration, Putin himself is not talking to the rest of the world, he doesn't want to listen to the world, he doesn't want to respond on the arguments, Ukrainian arguments and arguments to de-escalate the situation and stop invasion."
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Deshchytsya's comments also echoed those made today by Ukraine's National Security and Defence Council chief Andriy Parubiy, who was appointed after leading the recent anti-government protests in Kiev.
"The aim of Putin is not Crimea but all of Ukraine," Parubiy told a mass unity rally in the Ukrainian capital. "His troops massed at the border are ready to attack at any moment," he added.