UNITED NATIONS (AP) -- Ukraine's deputy foreign minister says he fears an immanent Russian invasion.
Danylo Lubkivsky told reporters at the United Nations on Friday: "We have the information we are in danger."
He spoke as an official in Ukraine confirmed that pro-Russian forces had detained a team of military observers with the Organization for Security and Cooperation in Europe.
Lubkivsky said 20 members had been taken and called it shocking and unprecedented.
Tensions have spiked as Russia increases military exercises along the Ukraine border. Lubkivsky called it a "very dangerous development" and demanded that Russia withdraw its troops.
"We are going to protect our motherland against any invasion," Lubkivsky said. "We call on the Russians to stop this madness."