A Russian strike has hit a second major bridge in Kyiv, Mayor Vitali Klitschko has said, as Russia ramps up attacks on critical infrastructure in the Ukrainian capital.

The attack on Saturday morning damaged the road surface and trolleybus overhead wires on the Northern Bridge, Klitschko said, causing traffic to be blocked.

The strike comes after another key bridge in the city, Southern Bridge, was targeted multiple times by Russian drones on Thursday and Friday, with Klitschko earlier warning that such attacks were "tearing Kyiv apart".

The Northern and Southern bridges link the eastern and western parts of the capital and had not been hit before Thursday, signalling a new stage in Moscow's strategy.

Attacks on the Southern Bridge have caused major travel disruption since Thursday, with metro and car travel across it suspended.

Many of the city's residents - which number about three million - rely on the metro to travel across the city.