NATO concerned by Russian presence in Syria, Ukraine calmer

Foreign Secretary Philip Hammond arrives to attend a cabinet meeting at Number 10 Downing Street in London, Britain September 8, 2015. REUTERS/Stefan Wermuth

PRAGUE (Reuters) - Reports of growing Russian military activity in Syria are a cause for concern while the situation in eastern Ukraine seems calmer, NATO Secretary General Jens Stoltenberg said on Wednesday.

Lebanese sources said on Wednesday Russian forces have begun participating in military operations in Syria in support of government troops.