Russian fighter jets intercepted two US bombers over the Black Sea and the Baltic Sea on Friday, according to the Russian Defence Ministry.
The Su-27 and Su-30 fighter jets followed the US bombers from a safe distance and, according to the ministry, complying with international rules forced the B-1B to change direction.
Ten days ago, NATO planes rushed into Romanian airspace on May 19 to intercept two Russian Tu-22 bombers approaching Romania.
The interceptions of Russian planes near NATO airstrikes occurred 300 times in 2019, Radio Free Europe / Radio Liberty reported earlier, citing an anonymous North Atlantic Alliance official.
The Tass news agency reported in early May that Russia had begun assembling the prototype of a new bomber with stealth technology (invisible to radar).