Territorial disputes of Russia

After two years of a heroic defense that cost Russia more than one-third of its active duty military, Ukraine is nearing its breaking point. It is short of both men and ammunition. 

Some 12 Turkish fishermen, who sailed from Istanbul to Crimea to fish turbots, have been detained by the Russian Navy, the daily Milliyet has reported.

"Fishermen in two boats went to Crimea and caught around 1,500 turbots in a week and were nabbed on May 18 during their voyage back to Turkey," the daily wrote on May 27.

The 2014 invasion of Ukraine and seizure of the Crimean Peninsula is the top reason why the U.S. has sanctioned Russian individuals

Maintaining the status quo in the Black Sea provided by the Montreux Convention is of vital importance, Turkey's defense minister has said, calling on Ukraine and Russia to de-escalate tension and resolve problems through dialogue.

Russia's ambassador to the EU, Vladimir Chizhov, has rejected US warnings that a Russian attack on Ukraine is possible today.

According to world media, the Russians are deploying troops in the western part of the country and in Belarus.
CNN points out that this continued pressure on Ukraine from three directions has heightened fears that the Kremlin is indeed planning an invasion.