In response to the Russian sanctions imposed by the U.S. in wake of the Ukraine crisis, Russia will no longer allow the U.S. to use the International Space Station after 2020. It will also cease launching U.S. military satellites from its rocket engines.

Russia announced the shutdown of the International Space Station Tuesday as Ukrainian soldiers were killed in an ambush by militants, reports the Daily Mail.

Despite their clashes over foreign policy, the two countries have collaborated on space exploration. However, Russia's deputy Prime Minister Dmitry Rogozin announced that Moscow would stop supplying the U.S. with rocket engines used in military satellite launches and suspend operation of GPS ground stations in Russian territory.

The moves come after the U.S. banned some high-tech equipment sales to Russia as part of sanctions passed after the annexation of Crimea.

Rogozin, the head of Russia's space program, says Moscow will only supply its powerful RD-180 and NK-33 engines if it will not be used for military launches. He added, "We proceed from the fact that without guarantees that our engines are used for non-military spacecraft launches only, we won't be able to supply them to the U.S.," reports RT.

"We are ready to deliver these engines but on one condition that they will not be used to launch military satellites," he said.

In addition, Rogozin declared that "Starting June 1, we will halt the work of those stations on Russian territory."

Even though the Space Station is controlled by both American and Russian workers, it can only be reached by using Russia's Soyuz spacecraft.

Rogozin said U.S. plans to prohibit export licences for certain high-technology items were a major hit to the Russian industry.

"These sanctions are out of place and inappropriate," Rogozin said. "We have enough of our own problems."