"This somehow contradicts the public statements by the [US] administration in favor of political settlement of conflict in Ukraine," Alexander Lukashevich told journalists in Moscow.
The Russian diplomat expressed hope that US military command is aware that such actions do not look like a desire for a political settlement of the Ukrainian conflict.
"All together this is a very unpleasant factor and, as it seems to me, the military command should understand that such provocative actions may have the most serious consequences to the course of the settlement of this conflict," Lukashevich stressed.
The diplomat added that military presence close to a regional conflict zone is a very dangerous maneuver that could lead to what he described as "different unpleasant consequences."
In January, NATO Secretary General Jens Stoltenberg announced plans to boost the bloc's military presence in eastern Europe, also increasing the number of warships in the Black Sea.
On Wednesday, NATO Maritime Command announced that six NATO warships from the US, Canada, Italy, Germany, Turkey and Romania arrived to the Black Sea to start joint exercises.
